1 Section 1 Properties of Acids and Bases Objectives List five general properties of aqueous acids and bases. Name common binary acids and oxyacids, given their chemical formulas. List five acids commonly used in industry and the laboratory, and give two properties of each. Define acid and base according to Arrhenius s theory of ionization. Explain the differences between strong and weak acids and bases.
2 Section 1 Properties of Acids and Bases Acids 1. Aqueous solutions of acids have a sour taste. 2. Acids change the color of acid-base indicators. 3. Some acids react with active metals and release hydrogen gas, H 2. Ba(s) + H 2 SO 4 (aq) BaSO 4 (s) + H 2 (g) 4. Acids react with bases to produce salts and water. 5. Acids conduct electric current.
3 Section 1 Properties of Acids and Bases Acids, continued Acid Nomenclature A binary acid is an acid that contains only two different elements: hydrogen and one of the more electronegative elements. HF, HCl, HBr, and HI Binary Acid Nomenclature 1. The name of a binary acid begins with the prefix hydro-. 2. The root of the name of the second element follows this prefix. 3. The name then ends with the suffix -ic.
4 Section 1 Properties of Acids and Bases Acids, continued Acid Nomenclature, continued
5 Section 1 Properties of Acids and Bases Acids, continued Acid Nomenclature, continued An oxyacid is an acid that is a compound of hydrogen, oxygen, and a third element, usually a nonmetal. HNO 3, H 2 SO 4 The names of oxyacids follow a pattern. The names of their anions are based on the names of the acids.
6 Section 1 Properties of Acids and Bases Acids, continued Acid Nomenclature, continued
7 Section 1 Properties of Acids and Bases Some Common Industrial Acids Sulfuric Acid Sulfuric acid is the most commonly produced industrial chemical in the world. Nitric Acid Phosphoric Acid Hydrochloric Acid Concentrated solutions of hydrochloric acid are commonly referred to as muriatic acid. Acetic Acid Pure acetic acid is a clear, colorless, and pungent-smelling liquid known as glacial acetic acid.
8 Section 1 Properties of Acids and Bases Bases 1. Aqueous solutions of bases taste bitter. 2. Bases change the color of acid-base indicators. 3. Dilute aqueous solutions of bases feel slippery. 4. Bases react with acids to produce salts and water. 5. Bases conduct electric current.
9 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases An Arrhenius acid is a chemical compound that increases the concentration of hydrogen ions, H +, in aqueous solution. An Arrhenius base is a substance that increases the concentration of hydroxide ions, OH, in aqueous solution.
10 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases, continued Aqueous Solutions of Acids Arrhenius acids are molecular compounds with ionizable hydrogen atoms. Their water solutions are known as aqueous acids. All aqueous acids are electrolytes.
11 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases, continued Aqueous Solutions of Acids, continued Common Aqueous Acids
12 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases, continued Strength of Acids A strong acid is one that ionizes completely in aqueous solution. a strong acid is a strong electrolyte HClO 4, HCl, HNO 3 A weak acid releases few hydrogen ions in aqueous solution. hydronium ions, anions, and dissolved acid molecules in aqueous solution HCN Organic acids ( COOH), such as acetic acid
13 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases, continued Aqueous Solutions of Bases Most bases are ionic compounds containing metal cations and the hydroxide anion, OH. dissociate in water s HO 2 NaOH( ) Na ( aq ) + OH ( aq) Ammonia, NH 3, is molecular Ammonia produces hydroxide ions when it reacts with water molecules. NH 3( aq ) + H2O( l ) NH 4( aq ) + OH ( aq)
14 Section 1 Properties of Acids and Bases Arrhenius Acids and Bases, continued Strength of Bases The strength of a base depends on the extent to which the base dissociates. Strong bases are strong electrolytes
15 Section 1 Properties of Acids and Bases Relationship of [H 3 O + ] to [OH ]
16 Section 2 Acid-Base Theories Objectives Define and recognize Brønsted-Lowry acids and bases. Define a Lewis acid and a Lewis base. Name compounds that are acids under the Lewis definition but are not acids under the Brønsted-Lowry definition.
17 Section 2 Acid-Base Theories Brønsted-Lowry Acids and Bases A Brønsted-Lowry acid is a molecule or ion that is a proton donor. Hydrogen chloride acts as a Brønsted-Lowry acid when it reacts with ammonia. HCl NH NH + Cl 3 4 Water can act as a Brønsted-Lowry acid. H2O( l ) + NH 3( aq ) NH 4( aq ) + OH ( aq)
18 Section 2 Acid-Base Theories Brønsted-Lowry Acids and Bases, continued A Brønsted-Lowry base is a molecule or ion that is a proton acceptor. Ammonia accepts a proton from the hydrochloric acid. It acts as a Brønsted-Lowry base. HCl NH3 NH4 + Cl The OH ion produced in solution by Arrhenius hydroxide bases (NaOH) is the Brønsted-Lowry base. The OH ion can accept a proton
19 Section 2 Acid-Base Theories Brønsted-Lowry Acids and Bases, continued In a Brønsted-Lowry acid-base reaction, protons are transferred from one reactant (the acid) to another (the base). HCl NH NH + Cl acid base 3 4
20 Section 2 Acid-Base Theories Monoprotic and Polyprotic Acids A monoprotic acid is an acid that can donate only one proton (hydrogen ion) per molecule. HClO 4, HCl, HNO 3 only one ionization step HCl( g ) + H O( l) H O ( aq ) + Cl ( aq) 2 3
21 Section 2 Acid-Base Theories Monoprotic and Polyprotic Acids, continued A polyprotic acid is an acid that can donate more than one proton per molecule. H 2 SO 4, H 3 PO 4 Multiple ionization steps (1) (2) H SO ( l ) + H O( l ) H O ( aq ) + HSO ( aq) HSO aq + l aq + 2 4( ) H2O( ) H3O ( ) SO 4 ( l) Sulfuric acid solutions contain H 3 O +, 2 HSO4 and SO4 ions
22 Section 2 Acid-Base Theories Monoprotic and Polyprotic Acids, continued A diprotic acid is the type of polyprotic acid that can donate two protons per molecule H 2 SO 4 A triprotic acid is the type of polyprotic acid that can donate three protons per molecule. H 3 PO 4
23 Section 2 Acid-Base Theories Lewis Acids and Bases A Lewis acid is an atom, ion, or molecule that accepts an electron pair to form a covalent bond. The Lewis definition is the broadest of the three acid definitions. A bare proton (hydrogen ion) is a Lewis acid H ( aq ) + :NH ( aq) [H NH ] ( aq ) or [NH ] ( aq) 3 3 4
24 Section 2 Acid-Base Theories Lewis Acids and Bases, continued The formula for a Lewis acid need not include hydrogen. The silver ion can be a Lewis acid Ag ( aq ) + 2 :NH ( aq ) [H N Ag NH ] ( aq ) or [Ag(NH ) ] Any compound in which the central atom has three valence electrons and forms three covalent bonds can react as a Lewis acid. BF ( aq ) F ( aq ) BF ( aq) 3 4
25 Section 2 Acid-Base Theories Lewis Acids and Bases, continued Acid Base Definitions
26 Section 3 Acid-Base Reactions Objectives Describe a conjugate acid, a conjugate base, and an amphoteric compound. Explain the process of neutralization. Define acid rain, give examples of compounds that can cause acid rain, and describe effects of acid rain.
27 Section 3 Acid-Base Reactions Conjugate Acids and Bases The species that remains after a Brønsted-Lowry acid has given up a proton is the conjugate base of that acid. HF( aq ) + H2O( l ) F ( aq ) + H3O ( aq) acid conjugate base
28 Section 3 Acid-Base Reactions Conjugate Acids and Bases, continued Brønsted-Lowry acid-base reactions involve two acid-base pairs, known a conjugate acid-base pairs. HF( aq ) + H2O( l ) F ( aq ) + H3O ( aq) acid 1 base 2 base 1 acid 2
30 Section 3 Acid-Base Reactions Conjugate Acids and Bases, continued Strength of Conjugate Acids and Bases The stronger an acid is, the weaker its conjugate base The stronger a base is, the weaker its conjugate acid HCl( g ) + H O( l ) H O ( aq ) + Cl ( aq) 2 3 strong acid base acid weak base
31 Section 3 Acid-Base Reactions Conjugate Acids and Bases, continued Strength of Conjugate Acids and Bases, continued Proton transfer reactions favor the production of the weaker acid and the weaker base. HClO ( aq ) + H O( l ) H O ( aq ) + ClO ( aq) stronger acid stronger base weaker acid weaker base The reaction to the right is more favorable CH COOH( aq ) + H O( l ) H O ( aq ) + CH COO ( aq) weaker acid weaker base stronger acid stronger base The reaction to the left is more favorable
32 Section 3 Acid-Base Reactions Relative Strengths of Acids and Bases Relative Strengths of Acids and Bases
33 Section 3 Acid-Base Reactions Amphoteric Compounds Any species that can react as either an acid or a base is described as amphoteric. example: water water can act as a base H SO ( aq ) + H O( l ) H O ( aq ) + HSO ( aq) acid 1 base 2 acid 2 base 1 water can act as an acid NH 3( g ) + H2O( l ) NH 4( aq ) OH ( aq) base 1 acid 2 acid 1 base 2
34 Section 3 Acid-Base Reactions Amphoteric Compounds, continued OH in a Molecule The covalently bonded IOH group in an acid is referred to as a hydroxyl group. Molecular compounds containing OH groups can be acidic or amphoteric. The behavior of a compound is affected by the number of oxygen atoms bonded to the atom connected to the OH group.
35 Section 3 Acid-Base Reactions Oxyacids of Chlorine
36 Section 3 Acid-Base Reactions Neutralization Reactions Strong Acid-Strong Base Neutralization In aqueous solutions, neutralization is the reaction of hydronium ions and hydroxide ions to form water molecules. A salt is an ionic compound composed of a cation from a base and an anion from an acid. HCl( aq ) + NaOH( aq ) NaCl( aq ) H O( l) 2
37 Section 3 Acid-Base Reactions Acid Rain NO, NO 2, CO 2, SO 2, and SO 3 gases from industrial processes can dissolve in atmospheric water to produce acidic solutions. example: SO ( g ) + H O( l ) H SO ( aq) Very acidic rain is known as acid rain. Acid rain can erode statues and affect ecosystems.
Chemistry I Notes Unit 10: Acids and Bases Acids 1. Sour taste. 2. Acids change the color of acid- base indicators (turn blue litmus red). 3. Some acids react with active metals and release hydrogen gas,
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!! www.clutchprep.com CONCEPT: ACID IDENTIFICATION The most common feature of an acid is that many possess an H + ion called the. When it comes to acids there are 2 MAJOR TYPES that exist: are acids where
Reading Assignments: Chapter 15 in R. Chang, Chemistry, 8th Ed., McGraw-Hill, 2005 Or Related topics in other textbooks. Acids and Bases Consultation outside lecture room: Office Hours: Tuesday & Thursday
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There are three definitions for acids and bases we will need to understand. Arrhenius Concept: an acid supplies H + to an aqueous solution. A base supplies OH to an aqueous solution. This is the oldest
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As you work through the chapter, you should be able to: Advanced Placement Chemistry Chapters 14 16 Syllabus Chapter 14 Acids and Bases 1. Describe acid and bases using the Bronsted-Lowry, Arrhenius, and
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Section 14.1 Defining Acids and Bases Properties of acids and bases Chapter 14 Properties of Acids and Bases taste sour Acids taste bitter Bases conduct electricity no characteristic feel react with metals