Acids, Bases, Salts, & Buffers
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1 Acids, Bases, Salts, & Buffers 1.55 ns CONDUCTIVITY METER
2 Part 1A Conductivity Measurements of Acids & Bases 1.55 ns CONDUCTIVITY METER X X H2O HCl CH3COOH HNO3 CH3CH2CH2NH2 KOH NaOH NH3 CH3CH2OH X DI water Hydrochloric acid Acetic acid Nitric acid Propylamine Potassium hydroxide Sodium hydroxide Ammonia Ethyl alcohol 1. place conductivity probe in X solution 2. allow to sit for 1 min, measure conductivity 3. rinse probe with DI water before next use 4. measure all solutions with conductivity probe
3 Part 1B Calibration of the ph Meter 4.00 ph ph METER IMPORTANT: this is NOT a comprehensive procedure for ph meter calibration. You MUST watch the How to calibrate a ph meter video posted on Blackboard Week 6 (link). ph 7 Kimwipes 1. push the mode button on the ph meter 2. put the probe in ph 7 solution and set the ph meter at ph 7 DI 4. wipe probe with Kimwipes 5. repeat steps 1-4 with ph 4 solution 3. take probe out of ph solution, rinse with DI water
4 Part 1B ph & H3O + Concentration 7.00 ph ph METER 1. pour ml of strong/weak electrolyte solution in 30 ml beaker 2. place ph meter, allow to sit for 1 min, read ph 3. rinse probe with DI water before next use strongly acidic weakly acidic neutral weakly basic strongly basic Universal Indicator Colors
5 Part 1B ph & H3O + Concentration x dilution 5. dilute up to ml with DI water pour 10 ml of selected electrolyte solution in ml graduated cylinder 20 10
6 Part 1B ph & H3O + Concentration 7.00 ph ph METER place ph meter in 10x diluted solution 7. allow to sit for 1 min, read ph 8. rinse probe with DI water before next use
7 Part 1B ph & H3O + Concentration x dilution 10. dilute up to ml with DI water pour 10 ml of 10x diluted solution in ml graduated cylinder 20 10
8 Part 1B ph & H3O + Concentration 7.00 ph ph METER place ph meter in x diluted solution 12. allow to sit for 1 min, read ph 13. rinse probe with DI water before next use
9 Part 2A Conductivity Measurements of Salts 1.55 ns CONDUCTIVITY METER Y Y NaCl KNO3 NaHCO2 NaCH3CO2 NH4NO3 CH3CH2CH2NH3Cl Y Sodium chloride Potassium nitrate Sodium formate Sodium acetate Ammonium nitrate Propylamine hydrochloride 1. place conductivity probe in Y solution 2. allow to sit for 1 min, measure conductivity 3. rinse probe with DI water before next use 4. measure all solutions with conductivity probe
10 Part 2B ph Measurements of Water & Salts 1. add 1 drop of universal indicator 2. mix well, observe ph 1 ml DI water strongly acidic weakly acidic neutral weakly basic strongly basic Universal Indicator Colors
11 Part 2B ph Measurements of Water & Salts 3. add 1 drop of universal indicator 4. boil 50 ml of DI water in ml beaker 5. done when ph indicator turns green (neutral) 6. quickly proceed next to avoid CO2 reabsorption
12 Part 2B ph Measurements of Water & Salts 1. add 1 drop of universal indicator 2. add spatula of salt into test tube 3. mix well, observe ph 4. repeat for other salts use 1 ml of boiled DI water strongly acidic weakly acidic neutral weakly basic strongly basic Universal Indicator Colors
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