THE RACI TITRATION STAKES 2018
|
|
- Rolf Reeves
- 6 years ago
- Views:
Transcription
1 THE ROYAL AUSTRALIAN CHEMICAL INSTITUTE INCORPORATED THE RACI TITRATION STAKES 08 INSTRUCTIONS FOR TEAM MEMBERS THE CHALLENGE Vinegar is used to prepare many different kinds of sauces. The main constituent of any kind of vinegar is ethanoic acid, CH COOH, which is called acetic acid on the labels of commercial products. This gives vinegar its sharp taste. The Vinegar and Sauce Company is in a fine pickle! It needs to know the concentrations of three different samples of ethanoic acid, labelled A, B and C, for a new range of products it is developing, but does not have the resources to do the work itself. School students participating in this year s titration competition are being asked to help! Each member of your team will be performing two sets of acid-base titrations to determine the concentration of one of the three samples of ethanoic acid. THE PLAN FOR THE ANALYSIS Now CH COOH is a weak acid. To standardise (determine the precise concentration of) a CH COOH solution, you need to titrate it against a solution of a strong base of precisely known concentration. You will use NaOH solution for that purpose. The catch is, being a strong base, NaOH solution absorbs acidic oxides such as CO out of the air. So its concentration in a solution cannot be known ahead of time and must be worked out first, as quickly as possible after the bottle is opened before it absorbs any more CO. For that reason, the NaOH solution will first be standardised against the strong acid HCl. This solution will be supplied to you at the precisely known concentration of mol L -. The balanced equation for the first set of titrations is HCl(aq) + NaOH(aq) NaCl(aq) + H O(l) The balanced equation for the second set of titrations is CH COOH(aq) + NaOH(aq) CH COONa(aq) + H O(l)
2 The plan is summarised in Figure, on page. Figure. The plan for the analysis. The two sets of titrations you will perform will require you to achieve as precise results as possible. The end-point is the point at which drop of the solution being delivered by the burette causes the indicator to change colour. We assume that is indicating when the acid and base have exactly reacted with each other. As you will always have the NaOH in the burette, and the indicator you will use is phenolphthalein, the end-point will occur when just more drop of NaOH solution turns the solution from colourless to a permanent purple-pink colour. (Just before that, you will see a pink colour but it will disappear on swirling the solution.) The volume of solution delivered by the burette to reach the end-point is called the titre. If you have titres within 0.0 ml of each other, they are described as concordant results. They are the only ones used to calculate the unknown concentration. Figure on page shows the titration process you will use each time. Achieving concordant results As shown in Figure, your results will be more accurate if you can achieve at least concordant results. This is what to do if you do not have enough time to obtain concordant results.. If you only obtain concordant results, use these two results to determine the mean titre.. If you perform two accurate titrations but the titres are not within 0.0 ml of each other, use the average of these two titres for your calculations.. If you only perform one accurate titration, use this result for your calculations.
3 Figure. Performing the titrations. In the first set of titrations the acid delivered by pipette is the M HCl solution. In the second set, the acid you will use is the CH COOH solution, as shown in Figure. YOUR TEAM Your teacher will place you in a team of three. All team members will need to work together very efficiently to complete the challenge in time. You will be judged by your team results, not by your individual results.
4 SAFETY WARNING Before you start the challenge, make sure you are all wearing fully protective clothing with no loose sleeves, and safety glasses. Tie back hair that touches your shoulders. Only use a pipette filler to draw solutions up into the pipette. There must be no eating or drinking in the laboratory. GETTING STARTED THE MATERIALS YOU NEED Checklist of chemicals and equipment per team bottles M HCl solution bottle NaOH solution A bottle NaOH solution B bottle NaOH solution C bottle CH COOH solution A bottle CH COOH solution B bottle CH COOH solution C x dropper bottles phenolphthalein solution x clean dry burettes, labelled A, B and C x burette stands 6 x 0.00 ml clean, dry pipettes ( labelled A, labelled B and labelled C) x pipette fillers that fit 0.00 ml pipettes 9 x 00 ml clean, dry beakers labelled NaOH, labelled HCl, labelled CH COOH 9 x 50 ml clean, dry conical flasks x medium-sized clean, dry glass funnels x white ceramic tiles x wash bottles filled with de-ionised water Paper towel
5 SETTING UP THE EQUIPMENT Step. Set up the three burettes in their stands, with the white tile below the burette. Step. Spread paper towel out on the bench. Step. Next to the burette labelled A, place the following on the paper towel. x bottle of HCl solution, x bottle of NaOH solution A x bottle of CH COOH solution A x dropper bottle phenolphthalein x wash bottle x 0.00 ml pipettes x pipette filler that fits a 0.00 ml pipette x small beaker labelled NaOH x small beaker labelled HCl x small beaker labelled CH COOH x glass funnel x 50 ml conical flasks Step. Repeat Step for the other two burettes, with items marked B next to burette B and items marked C next to burette C. These will now be called Station A, Station B and Station C. Step 5. At each station, close the tap of the burette. Pour a little of the NaOH solution into the small beaker labelled NaOH. Now tip this into the burette using the funnel. Place the beaker under the burette. Make sure the burette does not leak. Swirl the solution around and drain into the beaker. Discard the solution down the sink. Do not rinse the beaker or funnel out with water! They will be used for filling the burette for all your titrations. Step 6. At each station pour a little of the HCl solution into the small beaker labelled HCl. Making sure the end of the pipette is below the surface of the solution, draw some of this HCl solution up into one of the pipettes until it is partly up the bulb, using the pipette filler. Swirl the solution around then empty the pipette over the sink. Make sure that none of the solution enters the pipette filler! This pipette will only be used for the HCl solution. The other pipette will only be used for the CH COOH solution. Ensure they do not get mixed up. 5
6 THE COMPETITION BEGINS! Now that your equipment is ready, it is time to start the competition. Once you have been told to begin and until the end of the competition, there must be no communication with members of other teams. You may ask for advice and guidance from a supervisor. You will need to communicate and work closely with other members of your team. You have 90 minutes to perform all your titrations and calculations and complete the results sheet. You will be given 0 minutes warning before the end. THE EXPERIMENTAL PROCEDURE FOR EACH STATION Titrations Set Standardising the NaOH solution Step. Step. Step. Step. Step 5. Step 6. Pour about 50 ml of the NaOH solution into the NaOH beaker. After closing the burette tap, carefully pour the NaOH solution into the burette using the funnel until it reaches just below the zero mark. Now place the beaker under the burette and slowly let a little solution through so that the stem of the burette below the tap now contains solution, then close the tap. Do not attempt to add more NaOH to make up the volume to the zero mark! This would be a waste of precious time! Remove the funnel. Pour about 50 ml of the HCl solution into the HCl beaker. Making sure the end of the pipette is below the surface of the solution, draw some of this HCl solution up into one of the pipettes until it is just above the etched mark, using the pipette filler. Holding the pipette above the beaker, now slowly let some solution out until the bottom of the meniscus just sits on the etched mark. Transfer the HCl to one of the conical flasks and let it drain into the flask. Do not attempt to shake out or blow out the last drop! The etched mark already takes the volume of that drop into account. Add 5 drops of phenolphthalein. Place the flask under the burette, raising or lowering the burette so that its tip just reaches the bottom of the vertical part of the flask. Record the initial volume of the NaOH in the results table on page 8. Slowly add the NaOH to the flask with swirling, until drop changes the solution from colourless to a purple-pink that does not disappear on swirling. Occasionally rinse the sides of the flask with a little water using the wash bottle to ensure all the solution can react. Record the final volume of the NaOH in the same results table. Repeat Steps to 5 as many times as required and as time allows, except you will not need to fill the burette stem below the tap each time. It will already be full. Always use the same top section of the burette, from just below the zero mark, as this will reduce instrumental error and increase your chance of obtaining concordant results. It also will avoid running out of solution before the end-point is reached. 6
7 At this point, you may wish to calculate the concentration of the NaOH in bottles A, B and C. See the advice on page regarding which results should be used for your calculations. Each answer will be different, but we have been advised that in each case [NaOH] is somewhere between M and 0.00 M. If you get results outside this range, something has gone wrong. Most probably there is an error in your calculations, so check them, including your unit conversions. Titrations Set Standardising the CH COOH solution This procedure will be the same as for Titrations Set, except that the acid used will be CH COOH, and your results should be recorded in the table on page 9. Note:. Thoroughly wash the three conical flasks with water then rinse with de-ionised water before you start.. Ensure that the pipette and beaker used for HCl are rinsed over the sink then removed from the station so they do not contaminate the CH COOH. You are now able to complete your calculations. CALCULATION GUIDE Example: Standardising the NaOH solution See the equation for this reaction on page. All answers should be given to significant figures. The amount of HCl in mol in each titration is given by n(hcl) = c x V where c = concentration in mol L - = x V = volume = 0.00 ml = L = mol From the equation, since the mole ratio NaOH : HCl = : n(naoh) = n(hcl) = mol Now c(naoh) = n/v where V = mean titre = ml = L Hence [NaOH] = mol L - 7
8 GROUP RESULTS Titrations Set Note: All volumes must be recorded to decimal places. Use the key to mark the results used to calculate each mean titre. NaOH solution Run Initial burette reading Final burette reading Titre A Mean titre for 0.00 ml M HCl B Mean titre for 0.00 ml M HCl C Mean titre for 0.00 ml M HCl Key * = results used to determine mean titre 8
9 Titrations Set Note: All volumes must be recorded to decimal places. Use the key to mark the results used to calculate each mean titre. NaOH solution Run Initial burette reading Final burette reading Titre A Mean titre for 0.00 ml CH COOH solution A B Mean titre for 0.00 ml CH COOH solution B C Mean titre for 0.00 ml CH COOH solution C Key * = results used to determine mean titre 9
10 GROUP CALCULATIONS Titrations Set : Standardising the NaOH solutions From page 7, n(hcl) used each time = mol NaOH Solution A n(naoh) = n(hcl) = mol Now c(naoh) = n/v where V = mean titre = ml = L Hence [NaOH] = mol L - NaOH solution B n(naoh) = n(hcl) = mol Now c(naoh) = n/v where V = mean titre = ml = L Hence [NaOH] = mol L - NaOH solution C n(naoh) = n(hcl) = mol Now c(naoh) = n/v where V = mean titre = ml = L Hence [NaOH] = mol L - Check! Is each [NaOH] is somewhere between M and 0.00 M? Is each [NaOH] given to significant figures? 0
11 GROUP CALCULATIONS continued Standardising the CH COOH solutions See the equation for this reaction on page. The mole ratio CH COOH : NaOH = Hence the mole relationship is n(ch COOH) = x n(naoh) CH COOH solution A [NaOH solution A] = mol L - Mean titre of NaOH solution A = ml = L n(naoh) = c x V = x = mol Hence n(ch COOH) = mol V(CH COOH) = 0.00 ml = L Hence [CH COOH] = n / V = mol L - CH COOH solution B [NaOH solution B] = mol L - Mean titre of NaOH solution B = ml = L n(naoh) = c x V = x = mol Hence n(ch COOH) = mol V(CH COOH) = 0.00 ml = L
12 CH COOH solution C [NaOH solution C] = mol L - Mean titre of NaOH solution C = ml = L n(naoh) = c x V = x = mol Hence n(ch COOH) = mol V(CH COOH) = 0.00 ml = L Hence [CH COOH] = n / V = mol L - Check! Each [CH COOH] should be somewhere between M and 0.00 M? Are yours? Check your calculations if not. Is each [NaOH] given to significant figures? The sheet you submit to the RACI electronically is on page. Be very careful when you copy the required information from your results tables and calculations! Double-check you have done it correctly. And double-check that the names of all your team members are spelled correctly. The RACI hopes you have enjoyed participating in this year s competition. The Vinegar and Sauce Company is very grateful for all the help you are giving them!
13 RACI TITRATION STAKES 08 - RESULT SHEET SCHOOL NAME TEAM MEMBERS TITRATION RESULTS Identity of NaOH solution NaOH solution A NaOH solution B NaOH solution C Volume of M HCl solution * Mean titre of NaOH solution * This should be 0.00 ml in most cases. Identity of NaOH solution Volume and identity of CH COOH solution * NaOH solution A CH COOH solution A: NaOH solution B CH COOH solution B: NaOH solution C CH COOH solution C: * This should be 0.00 ml in most cases. Mean titre of NaOH solution CONCENTRATIONS OF SOLUTIONS Solution Concentration NaOH solution A mol L - NaOH solution B mol L - NaOH solution C mol L - CH COOH solution A mol L - CH COOH solution B mol L - CH COOH solution C mol L -
TITRATION STAKES 2018 INSTRUCTIONS TO TEAM MEMBERS
THE ROYAL AUSTRALIAN CHEMICAL INSTITUTE INCORPORATED TITRATION STAKES 2018 INSTRUCTIONS TO TEAM MEMBERS (A copy of these instructions is to be given to every participant before commencement of the competition.
More informationAustralian National Titration Competition. Basics of Titration
Basics of Titration prepared by Elaine Bergmann on behalf of the Chemical Education Group of the Royal Australian Chemical Institute, Queensland Branch Contents: 1 Basic Theory of Acid-Base Titration 2
More information# 12 ph-titration of Strong Acids with Strong Bases
# 12 ph-titration of Strong Acids with Strong Bases Purpose: A strong acid solution is titrated with a strong base solution. A titration curve is then used to determine the endpoint and find the concentration
More informationChemistry 143 Acid Base Titration Dr. Caddell. Titrating Acid
Titrating Acid In this lab you will first determine the concentration of sodium hydroxide in a stock solution that you prepare. You will then use that stock sodium hydroxide solution to titrate a solution
More informationRACI TITRATION STAKES ENTRY FORM
RACI TITRATION STAKES ENTRY FORM PLEASE PRINT CLEARLY School:. Address:... Postcode: Telephone:... Name of Teacher:... Email: (receipts will be emailed where possible)... Number of Teams*: (members names
More informationchemrevise.org 22/08/2013 Titrations N Goalby Chemrevise.org Titrations
Titrations N Goalby Chemrevise.org Titrations Titrations are done often to find out the concentration of one substance by reacting it with another substance of known concentration. They are often done
More informationNCEA Chemistry 2.1 Quantitative Analysis AS 91161
NCEA Chemistry 2.1 Quantitative Analysis AS 91161 What is this NCEA Achievement Standard? When a student achieves a standard, they gain a number of credits. Students must achieve a certain number of credits
More informationChemistry 143 Experiment #11 Acid Base Titration Dr. Caddell. Titrating Acid
Titrating Acid In this lab you will first determine the concentration of sodium hydroxide in a stock solution that you prepare. You will then use that stock sodium hydroxide solution to titrate a solution
More informationPercentage of Acetic Acid in Vinegar
Microscale Percentage of Acetic Acid in Vinegar When sweet apple cider is fermented in the absence of oxygen, the product is an acid, vinegar. Most commercial vinegars are made by fermentation, but some,
More informationThe method used to determine the concentration of a known substance using another, standard, solution.
Titrations What are titrations? The neutralisation reaction between an acid and a base can be very useful. If an acidic solution of known concentration (a standard solution) is added to a basic (alkaline)
More informationExperiment #7. Titration of Vinegar
Experiment #7. Titration of Vinegar Goals 1. To determine the mass percent of acetic acid in a solution via titration. 2. To master the technique of titration. Introduction Vinegar is a common household
More informationTitration with an Acid and a Base
Skills Practice Titration with an Acid and a Base Titration is a process in which you determine the concentration of a solution by measuring what volume of that solution is needed to react completely with
More informationCHEM Practice to be done before the lab. Experiment 9 Introduction to Volumetric Techniques II. Objectives
1 CHEM 0011 Experiment 9 Introduction to Volumetric Techniques II Objectives 1. To learn the proper technique to use a burette. 2. To learn the proper technique to carry out a titration. 3. To verify the
More informationTitrations. Method for Titration. N Goalby chemrevise.org 1. Using the pipette
Titrations Titrations are done often to find out the concentration of one substance by reacting it with another substance of known concentration. They are often done with neutralisation reactions, but
More informationIn this laboratory exercise we will determine the percentage Acetic Acid (CH 3 CO 2 H) in Vinegar.
The titration of Acetic Acid in Vinegar In this laboratory exercise we will determine the percentage Acetic Acid (CH CO H) in Vinegar. We will do this by Titrating the Acetic Acid present with a Strong
More informationTRATION: ANALYSIS OF VINE
Experiment 10 Name: 22 Ti TRATION: ANALYSIS OF VINE 31 Ga R In this experiment, you will learn the concept and technique of titration. You will determine the concentration of acetic acid in commercial
More informationCHM111 Lab Titration of Vinegar Grading Rubric
Name Team Name CHM111 Lab Titration of Vinegar Grading Rubric Criteria Points possible Points earned Lab Performance Printed lab handout and rubric was brought to lab 3 Safety and proper waste disposal
More informationChecklist for Titration
Checklist for Titration 1) Rinse the burette with distilled water? 2) Rinse the burette with the solution that it will be used to contain? 3) Ensure that the tap of the burette is closed before filling
More informationChemical Reactions: Titrations
1 Chemical Reactions: Titrations ORGANIZATION Mode: laboratory work, work in pairs Grading: lab notes, lab performance (titration accuracy), and post-lab report Safety: goggles, lab coat, closed-toe shoes,
More informationAcid-Base Titration Acetic Acid Content of Vinegar
Acid-Base Titration Acetic Acid Content of Vinegar Prelab Assignment Read the entire lab. Write an objective and any hazards associated with this lab in your laboratory notebook. On a separate sheet of
More informationWorked solutions to student book questions Chapter 4 Analysing acids and bases
Q. Antacid tablets should normally be chewed before they are swallowed. Why? A. Antacid tablets are normally chewed to provide a larger surface area for faster reaction with stomach acids. Q. A laboratory
More informationExperiment 7: ACID-BASE TITRATION: STANDARDIZATION OF A SOLUTION
Experiment 7: ACID-BASE TITRATION: STANDARDIZATION OF A SOLUTION Purpose: Determine molarity of a solution of unknown concentration by performing acid-base titrations Performance Goals: Apply the concepts
More information#13 ph-titration of Weak Acids with Strong Bases
#13 ph-titration of Weak Acids with Strong Bases Purpose: A weak acid solution is titrated with a strong base solution. A titration curve is then used to identify the unknown acid and to find its concentration.
More information1. Making salt an introduction to some basic techniques Student Sheet
Teaching AS Chemistry Practical Skills 1. Making salt an introduction to some basic techniques Student Sheet This practical is intended to help you become confident in some of the skills you may have used
More informationPOGIL LAB EXERCISE 15 HOW DO YOU STANDARDIZE AN ACID AND BASE?
POGIL LAB EXERCISE 15 HOW DO YOU STANDARDIZE AN ACID AND BASE? POGIL LAB 15 Page 1 of 10 Each member should assume his or her role at this time. The new manager takes charge of the POGIL folder and hands
More informationAcid-Base Titration. M M V a
Acid-Base Titration Pre-Lab Discussion In the chemistry laboratory, it is sometimes necessary to experimentally determine the concentration of an acid solution or a base solution. A procedure for making
More information13. Determining the value of K c for an equilibrium reaction Student Sheet
Appendix 2 13. Determining the value of K c for an equilibrium reaction Student Sheet In this experiment you have the opportunity to use the skills you have developed by doing volumetric analysis to determine
More informationVolumetric analysis involving acids and alkalis
Chapter 19 Volumetric analysis involving acids and alkalis 19.1 Standard solutions 19.2 Acid-alkali titrations 19.3 Calculations on volumetric analysis 19.4 Writing a laboratory report on volumetric analysis
More informationTitration of HCl with Sodium Hydroxide
Titration of HCl with Sodium Hydroxide Lab Report for the Subject of Advanced Chemistry Anon Durongpisitkul, Karis Katekovit, Varun Saketharam,Thanon Thamvorapol, Chanon Anektanasup- January 28, 2017 1
More informationChapter 9. Volumetric Analysis
Chapter 9 Volumetric Analysis The terms volumetric analysis, titrimetry and titration are used interchangeably to describe a procedure which analyses chemicals in solution by accurate volume measurement.
More informationVolumetric Analysis Acids & Bases HL
Name: Volumetric Analysis 1. Concentrations of Solutions 3. Volumetric Analysis Objectives -define solution -define concentration -define molarity -express concentration of solutions in mol/l(molarity),
More informationNaOH (aq) + HCl (aq) NaCl (aq) + H 2 O (l)
EXPERIMENT 21 Molarity of a Hydrochloric Acid Solution by Titration INTRODUCTION Volumetric analysis is a general term meaning any method in which a volume measurement is the critical operation; however,
More informationUpon completion of this lab, the student will be able to:
1 Learning Outcomes EXPERIMENT 30A7: VINEGAR TITRATION Upon completion of this lab, the student will be able to: 1) Measure the amount of acetic acid in a solution of vinegar Introduction The molar concentration
More informationCHEM 30A EXPERIMENT 8 & 9: ACID- BASE TITRATION. Learning Outcomes. Introduction. Upon completion of this lab, the student will be able to:
1 Learning Outcomes CHEM 30A EXPERIMENT 8 & 9: ACID- BASE TITRATION Upon completion of this lab, the student will be able to: 1) Prepare a solution of primary standard 2) Determine the molar concentration
More informationUnit 5 Part 2 Acids, Bases and Salts Titrations, Indicators and the ph Scale UNIT 5 ACIDS, BASES AND SALTS
UNIT 5 ACIDS, BASES AND SALTS PART 2 TITRATIONS, INDICATORS AND THE PH SCALE Contents 1. The ph scale 2. Indicators 3. Acid-Base Titrations Key words: acidic, alkaline, neutral, ph, indicator, litmus,
More informationChem 2115 Experiment #7. Volumetric Analysis & Consumer Chemistry Standardization of an unknown solution, analysis of vinegar & antacid tablets
Chem 2115 Experiment #7 Volumetric Analysis & Consumer Chemistry Standardization of an unknown solution, analysis of vinegar & antacid tablets OBJECTIVE: The goals of this experiment are to learn titration
More information2 burets (50 ml) Standard solution of NaOH (0.600 M) Phenolphthalein indicator
Name: \[-[L Percentage of Acetic Acid In Vinegar Lab 4-5 INTRODUCTION: The quality of acid in a sample of vinegar may be found by titrating the sample against a standard basic solution. ost commercial
More informationTechniques for Volumetric Analysis
Techniques for Volumetric Analysis Volumetric analysis involves measuring the volumes of two solutions that react together. The basic principles are as follows. The solution to be analysed contains an
More informationTitration of Acetic Acid in Vinegar Minneapolis Community and Technical College v.9.17
Titration of Acetic Acid in Vinegar Minneapolis Community and Technical College v.9.17 Objective: To practice the correct use of the burette, volumetric pipette, and volumetric flask in analytical titrations.
More informationAcids and Alkalis. Student Notes. Registered Charity Number
Acids and Alkalis Student Notes Acids and Alkalis is funded as part of the Reach and Teach educational programme supported by the Wolfson Foundation THE WOLFSON FOUNDATION www.rsc.org Registered Charity
More informationEXPERIMENT #8 Acid-Base I: Titration Techniques
EXPERIMENT #8 Acid-Base I: Titration Techniques OBJECTIVES: Dispense a precise volume of a solution with a buret Titrate a known volume of acid solution with a standard solution of base Reach a proper
More informationFor each of the Prescribed Practical Activities (PPAs) you will be provided with:
SECTION 7 Writing PPA Reports Introduction For each of the Prescribed Practical Activities (PPAs) you will be provided with: a student guide, which contains advice on preparing for and carrying out the
More informationNCEA Chemistry 2.1. Quantitative Analysis AS The Mole. What does this Internal Assessment involve?
NCEA Chemistry 2.1 Quantitative Analysis AS 91161 What does this Internal Assessment involve? Carry out quantitative analysis, including an acid-base titration Demonstrate comprehensive understanding involves:
More informationAdvanced Unit 7: Chemistry Practical Examination (SET A) Candidates must have: Scientific calculator Ruler
Write your name here Surname Other names Pearson Edexcel International Advanced Level Centre Number Candidate Number Chemistry Advanced Unit 7: Chemistry Practical Examination (SET A) Monday 8 May 2017
More informationCore practical 11: Find the amount of iron in an iron tablet using redox titration
Core practical 11 Teacher sheet Core practical 11: To perform a redox titration involving Fe 2+ (aq) and MnO4 (aq) Specification links Use eye protection. Practical techniques 1, 4, 5, 11 CPAC 1a, 2a,
More informationUnit 3 Chemistry - Volumetric Analysis
Unit 3 Chemistry Volumetric Analysis Volumetric analysis is a quantitative chemical analysis used to determine the unknown concentration of one reactant [the analyte] by measuring the volume of another
More informationExperiment 20-Acid-Base Titration: Standardization of KOH and Determination of the Molarity and/or Percent Composition of an Acid Solution
Experiment 20-Acid-Base Titration: Standardization of KOH and Determination of the Molarity and/or Percent Composition of an Acid Solution In this experiment, you will determine the molarity and percent
More informationLearn to do quantitative titration reactions. Observe the mole ratios of several simple chemical reactions.
CHAPTER 6 Stoichiometry of Reactions in Solution Objectives The objectives of this laboratory are to: Learn to do quantitative titration reactions. Observe the mole ratios of several simple chemical reactions.
More informationEXPERIMENT. Estimate the strength of given sodium carbonate solution by titrating it against HCl solution using methyl orange as indicator.
EXPERIMENT AIM Estimate the strength of given sodium carbonate solution by titrating it against HCl solution using methyl orange as indicator. Approximately M/40 HCl solution is provided. Prepare your
More informationPeriodicity of Properties of Oxides
Microscale Periodicity of Properties of Oxides Some oxides produce acidic solutions when they dissolve in water. These oxides are classified as acidic oxides (acid anhydrides), and they are the primary
More informationWrite the ionic equation for this neutralisation reaction. Include state symbols.
Q1.Sodium hydroxide neutralises sulfuric acid. The equation for the reaction is: 2NaOH + H 2 SO 4 Na 2 SO 4 + 2H 2 O (a) Sulfuric acid is a strong acid. What is meant by a strong acid? (b) Write the ionic
More informationShe carries out two experiments.
1 A student investigates the reaction of aqueous sodium hydroxide with two different aqueous solutions of hydrochloric acid, solution X and solution Y. She carries out two experiments. Experiment 1 Using
More informationTitration of citric acid in juice
Page 4 LABORATORY LEARNING ACTIVITY Titration of citric acid in juice Introduction One common task that chemists must perform is to determine the concentration of a chemical using titration. There are
More informationDetermination of the K a Value and Molar Mass of an Unknown Weak Acid
10 Determination of the K a Value and Molar Mass of an Unknown Weak Acid Introduction In this experiment you will titrate a monoprotic weak acid with a strong base, and measure the titration curve with
More informationEXPERIMENT. Titration for Acetic Acid in Vinegar
EXPERIMENT Titration for Acetic Acid in Vinegar Hands-On Labs, Inc. Version 42-0208-00-02 Review the safety materials and wear goggles when working with chemicals. Read the entire exercise before you begin.
More informationName: Date: AP Chemistry. Titrations - Volumetric Analysis. Steps for Solving Titration Problems
Name: Date: AP Chemistry Titrations - Volumetric Analysis Term Volumetric analysis Burette Pipette titrate titre aliquot end point equivalence point indicator primary standard standardisation secondary
More informationSafety Note: Safety glasses and laboratory coats are required when performing this experiment
The Determination of Hypochlorite in Bleach Reading assignment: Burdge, Chemistry 4 th edition, section 4.6. We will study an example of a redox titration in order to determine the concentration of sodium
More informationContents. Answers 73. F01 Target 7 Single Science Chemistry WB indd 3
Contents Unit 1 Moles 1 Get started 2 1 How do I describe what a mole is? 3 2 How do I calculate how many moles, or particles, there are in a substance? 4 3 How do I calculate the mass of a reactant or
More informationChemistry Project. Measuring the Amount of Acetic Acid In Vinegar by Titration with an Indicator Solution
Chemistry Project easuring the Amount of Acetic Acid In inegar by Titration with an Indicator Solution Index 1 Certificate 2 Acknowledgement Aim 4 Objective 5 Introduction 6 aterials and Equipment 7 Theory
More informationIntroduction. Objectives
Experiment: Acids, Bases, and Buffers * Introduction Many common household solutions contain acids and bases. Acid-base indicators, such as litmus and red cabbage juice, turn different colors in acidic
More informationExperiment: Titration
Experiment: Titration INTRODUCTION In this experiment you will be determining the volume of sodium hydroxide solution of known concentration required to neutralize a known mass of an unknown acid in solution.
More informationEXPERIMENT A7: VINEGAR TITRATION. Learning Outcomes. Introduction. Upon completion of this lab, the student will be able to:
1 Learning Outcomes EXPERIMENT A7: VINEGAR TITRATION Upon completion of this lab, the student will be able to: 1) Prepare a solution of primary standard 2) Determine the molar concentration of a solution
More informationPreLAD: b. KHP is a monoprotic acid, what are the number of moles of ionizable H + in the approximately 0.25 g of KHP?
LAD G.1 (pg! 1 of 6! ) What % of vinegar is really acetic acid? Name Per What part of the solution is really HC2H3O2 aka CH3COOH? What is the Ka of acetic acid? Introduction: The acid in vinegar is acetic
More informationExperiment 10. Acid Base Titration
Experiment 10 Acid Base Titration Definitions: Titration A technique to accurately and precisely measure something, most often acids or bases Acids Most acids are molecules that behave as if they were
More informationTitration of citric acid in juice: Technical Notes
Page 25 TECHNICAL NOTES Titration of citric acid in juice: Technical Notes Introduction This is a fairly standard titration except for the following: commercial lemon juice is used. This juice is slightly
More information6 Acid Base Titration
E x p e r i m e n t Acid Base Titration Experiment : http://genchemlab.wordpress.com/-titration/ objectives To understand the concept of titration. To explain the difference between the analyte and standard
More informationExperiment 18 - Absorption Spectroscopy and Beer s Law: Analysis of Cu 2+
Experiment 18 - Absorption Spectroscopy and Beer s Law: Analysis of Cu 2+ Many substances absorb light. When light is absorbed, electrons in the ground state are excited to higher energy levels. Colored
More informationPotentiometric measurement of ph
Potentiometric measurement of ph Determination of ph can be done by simple colorimetric methods using acid-base indicators (ph test strips). Nevertheless, the precision of such methods is mostly insufficient.
More informationChem 2115 Experiment #7. Volumetric Analysis & Consumer Chemistry Standardization of an unknown solution and the analysis of antacid tablets
Chem 2115 Experiment #7 Volumetric Analysis & Consumer Chemistry Standardization of an unknown solution and the analysis of antacid tablets OBJECTIVE: The goals of this experiment are to learn titration
More information+ H 2 O Equation 1. + NaOH CO 2 Na
Experiment # 5 VINEGAR: AN FDA INVESTIGATION Objective In this experiment, you will play the role of an FDA analytical chemist, You will verify whether a vinegar manufacturer's quality control lab remains
More informationExperiment #10: Analysis of Antacids
Experiment #10: Analysis of Antacids Purpose: In this experiment you will prepare one solution that is approximately 0.1 M NaOH. Then you will standardize this solution, which means that you will experimentally
More informationName: C4 TITRATIONS. Class: Question Practice. Date: 97 minutes. Time: 96 marks. Marks: GCSE CHEMISTRY ONLY. Comments:
C4 TITRATIONS Question Practice Name: Class: Date: Time: 97 minutes Marks: 96 marks Comments: GCSE CHEMISTRY ONLY Page of 3 Sodium hydroxide neutralises sulfuric acid. The equation for the reaction is:
More informationAcid-Base Titrations
Chem 1252, General Chemistry I Lab Johnson Acid-Base Titrations Introduction Titration is a convenient quantitative method for accurately determining unknown concentrations of solutions. A necessary requirement
More informationChemistry Assessment Unit AS 3
Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education 2009 Chemistry Assessment Unit AS 3 assessing Module 3: Practical Examination 1 ASC31 [ASC31] MONDAY 11 MAY,
More informationExperiment 8 Introduction to Volumetric Techniques I. Objectives
Experiment 8 Introduction to Volumetric Techniques I Objectives 1. To learn the proper technique to use a volumetric pipette. 2. To learn the proper technique to use a volumetric flask. 3. To prepare a
More informationExperiment 5E BOTTLES WITHOUT LABELS: STUDIES OF CHEMICAL REACTIONS
Experiment 5E BOTTLES WITHOUT LABELS: STUDIES OF CHEMICAL REACTIONS FV 1-21-16 MATERIALS: Eight 50 ml beakers, distilled water bottle, two 250 ml beakers, conductivity meter, ph paper (A/B/N), stirring
More informationChemical Bonds. MATERIALS 24-well microplate calcium chloride candle citric acid conductivity tester ethanol gloves iron ring lab apron
Microscale Chemical Bonds Chemical compounds are combinations of atoms held together by chemical bonds. These chemical bonds are of two basic types ionic and covalent. Ionic bonds result when one or more
More informationLab Activity 3: Gravimetric Stoichiometry 2
Chemistry 2202 Gravimetric Stoichiometry Lab 2 1 Lab Activity 3: Gravimetric Stoichiometry 2 Introduction: Stoichiometry involves making predictions about how much of one substance should react or be produced
More informationChemistry 101 Experiment 12B-ANALYSIS OF COMMERCIAL VINEGARS
Vinegar is a solution of acetic acid (HC2H3O2). The strength or concentration of the vinegar is usually given on the label of the bottle in percent by weight or percent acidity. The United States Food
More informationSupernatant: The liquid layer lying above the solid layer after a precipitation reaction occurs.
Limiting Reagent Introduction The quantities of substances involved in a chemical reaction represented by a balanced equation are often referred to as stoichiometric amounts. Solution stoichiometry is
More informationNEUTRALIZATION TITRATION-2 TITRATION OF AN ANTACID (Exp. 4)
Objective NEUTRALIZATION TITRATION-2 TITRATION OF AN ANTACID (Exp. 4) The aim of this experiment is to carry out titration of antacid tablets and to determine acetic acid content of vinegar. a) Titration
More informationSupernatant: The liquid layer lying above the solid layer after a precipitation reaction occurs.
Limiting Reagent Introduction The quantities of substances involved in a chemical reaction represented by a balanced equation are often referred to as stoichiometric amounts. Solution stoichiometry is
More informationSynthesis of Benzoic Acid
E x p e r i m e n t 5 Synthesis of Benzoic Acid Objectives To use the Grignard reagent in a water free environment. To react the Grignard reagent with dry ice, CO 2(s). To assess the purity of the product
More information10.2. Neutralization Reactions and Acid-base Titrations. HCl(aq) + KOH(aq) HOH(l) + KCl(aq) Neutralization Reactions SECTION.
SECTION 10.2 Neutralization Reactions and Acid-base Titrations Key Terms neutralization reaction salt titration titrant burette end point equivalence point Acids and bases are found in air, soil, oceans,
More informationChemistry Assessment Unit AS 3
Centre Number 71 Candidate Number ADVANCED SUBSIDIARY (AS) General Certificate of Education 2009 Chemistry Assessment Unit AS 3 assessing Module 3: Practical Examination 2 ASC32 [ASC32] FRIDAY 15 MAY,
More informationPlant Indicators for Acids and Bases
SCIENCE EXPERIMENTS ON FILE Revised Edition 5.28-1 Plant Indicators for Acids and Bases Carole R. Goshorn Topic Acid/base indicators Time Preparation by teacher 50 minutes; Part B, 45 minutes! Safety Adult
More informationAcid Base Titration Experiment ACID - BASE TITRATION LAB
ACID - BASE TITRATION LAB MATERIALS and CHEMICALS Burette 50 ml Burette clamp Ring stand Stirring rod Plastic funnel Beakers (50 ml, 100 ml, 400 ml) Graduated cylinder (25 ml, 50 ml) 0.10 M NaOH 0.10 M
More informationVolumetric Measurement Techniques. Technique #1 Use of a Burette. Technique #2 Use of a Pipette. Technique #3 Use of a Volumetric Flask
Volumetric Measurement Techniques Technique #1 Use of a Burette Technique #2 Use of a Pipette Technique #3 Use of a Volumetric Flask Technique #4 Use of a Bottle-Top Dispenser Last updated 12/6/2009 5:46
More informationAcid / Base Titrations
Acid / Base Titrations v051413_7pm Objectives: Determine the concentration of a base solution using an acid standard. Optional: Precipitate an ionic salt for percent yield determination using the standardized
More informationObjective: Science Classroom Laboratory Safety
Science Classroom Laboratory Safety Objective: Learn safety rules for working with chemicals and participating in a safe manner when carrying out lab procedures. Complete the safety and equipment assignment
More informationTITRATION OF AN ACID WITH A BASE
TITRATION OF AN ACID WITH A BASE 1 NOTE: You are required to view the podcast entitled Use of Burets for Titrations before coming to lab this week. To view the podcast, consisting of eight episodes, go
More informationThis document consists of 11 printed pages, 1 blank page and a Data Sheet for Chemistry.
ADVANCED SUBSIDIARY GCE 2813/04 CHEMISTRY Alternative to Practical TUESDAY 15 MAY 2007 Afternoon *CUP/T39887* Additional materials: Scientific calculator Data Sheet for Chemistry (Inserted) Candidate s
More informationExperiment 20: Analysis of Vinegar. Materials:
Experiment 20: Analysis of Vinegar Materials: graduated cylinder 6 M NaOH: Dilute Sodium Hydroxide 1000 ml Florence Flask & stopper KHC 8 H 4 O 4 : Potassium Hydrogen Phthalate (KHP) 125 ml Erlenmeyer
More informationHong Kong Diploma of Secondary Education Examination. Combined Science (Chemistry part)
Hong Kong Diploma of Secondary Education Examination Combined Science (Chemistry part) School-based Assessment Sample Tasks Teachers may use the sample tasks for non-profit making educational and research
More informationDownloaded From: AIM. Measuring the Amount of Acetic Acid In Vinegar by Titration with an Indicator Solution
AI easuring the Amount of Acetic Acid In inegar by Titration with an Indicator Solution This is to certify that ohit K.Das of class XII has completed the chemistry project entitled DETERINATION OF AOUNT
More informationPre-lab: Read section 9.9 (pages ) on acid-base titrations in the textbook. Complete the attached pre-lab by Tuesday, June 2.
Chemistry 121 Lab 5: Titration of an unknown acid Objective: Determine the concentration of an unknown monoprotic acid by titration, the process that matches the number of moles of base with the number
More informationChemical Analysis. Student Guide. National 5 Chemistry
Chemical Analysis Student Guide National 5 Chemistry Contents Page 3 Investigation A1 Calcium analysis of water Page 6 Investigation A2 Calcium analysis of milk Page 12 Investigation B Iron in tea and
More informationPURPOSE: 1. To illustrate an oxidation-reduction titration with potassium permanganate 2. To determine the percent mass of iron in an unknown.
PURPOSE: 1. To illustrate an oxidation-reduction titration with potassium permanganate 2. To determine the percent mass of iron in an unknown. PRINCIPLES: Oxidation and reduction reactions, commonly called
More informationCIE Chemistry A-Level Practicals for Papers 3 and 5
CIE Chemistry A-Level Practicals for Papers 3 and 5 Rate of Reaction Disappearing cross: Change in rate of the reaction of sodium thiosulphate with hydrochloric acid as temperature is changed: Na 2 S 2
More informationExperiment 2: Analysis of Commercial Bleach Solutions
Experiment 2: Analysis of Commercial Bleach Solutions I. Introduction The ability of household bleach to remove stains is related to the amount of oxidizing agent in it. The oxidizing agent in bleach is
More information