Acid - Base Worksheet - Answer Key
3 Pages

Acid - Base Worksheet - Answer Key

Course Number: PHYS 4A 60865, Fall 2009

College/University: Irvine Valley College

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ACID BASE WORKSHEET ANSWER KEY GENERAL CHEMISTRY Answer Key Acid Base Worksheet 1. Identify each of the following as an acid or a base. Write a chemical equation showing how it is an acid or a base according to the Arrhenius definition. (a) (b) (c) (d) Answer The Arrhenius definition defines an acid is a substance that products H+ ions in aqueous solution and a base as a substance that produces OH- ions in...

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BASE ACID WORKSHEET ANSWER KEY GENERAL CHEMISTRY Answer Key Acid Base Worksheet 1. Identify each of the following as an acid or a base. Write a chemical equation showing how it is an acid or a base according to the Arrhenius definition. (a) (b) (c) (d) Answer The Arrhenius definition defines an acid is a substance that products H+ ions in aqueous solution and a base as a substance that produces OH- ions in aqueous solution (a) NH4+ H+ (aq) + NH3 (aq) (a) KOH (aq) K (aq) + OH (aq) (b) HI (aq) H+ (aq) + I- (aq) (c) Sr(OH)2 (aq) Sr2+ (aq) + 2OH- (aq) + - NH4+ (aq) KOH (aq) HI (aq) Sr(OH)2 (aq) Acid Produces a proton Base Produces hydroxide Acid Produces a proton Base Produces hydroxide 2. Classify the following acids as weak or strong. Write an equation for the dissociation of each acid in water, according to the Bronsted-Lowry definition. (a) (b) (c) (d) (e) (f) Answer Notice that a single arrow is used for strong acid solutions and a double arrow is used for a weak acid solution (a) HNO3 (aq) + HOH (l) H3O+ (aq) + NO3- (aq) (b) HNO2 (aq) + HOH (l) H3O+ (aq) + NO2- (aq) (c) HBr (aq) + HOH (l) H3O (aq) + Br (aq) (d) HClO4 (aq) + HOH (l) H3O+ (aq) + ClO4- (aq) (e) HCOOH (aq) + HOH (l) H3O+ (aq) + CHOO- (aq) + + - Nitric acid Nitrous acid Hydrobromic acid Perchloric acid Formic acid (HCHO2) Acetic acid Strong Acid = 100% Dissociation Weak Acid = Less than 100% Dissociation Strong Acid = 100% Dissociation Strong Acid = 100% Dissociation Weak Acid = Less than 100% Dissociation (f) CH3COOH (aq) + HOH H3O (aq) + CH3COO (aq) Weak Acid = Less than 100% Dissociation PAGE 1 OF 3 ACID WORKSHEET BASE ANSWER KEY GENERAL CHEMISTRY 3. For each of the following reactions, identify the Brnsted-Lowry acid, the Brnsted-Lowry base, the conjugate acid, and the conjugate base. (a) HF (aq) + H2O (l) F- (aq) + H3O+ (aq) A B CB CA (b) H2SO4 (aq) + H2O (l) H3O+ (aq) + HSO4- (aq) A B CA CB (c) HSO4- (aq) + H2O (l) SO42- (aq) + H3O+ (aq) A B CB CA (d) C2H5NH+ (aq) + H2O (l) H3O+ (aq) + C2H5N (aq) A B CA CB 4. Write the name and formula for the conjugate base of each of the following acids. Is the conjugate base strong or weak? (a) H2SO3 (b) H2S (c) HNO3 Register to View AnswerH2SO3 (aq) + HOH (l) H3O+ (aq) + HSO3- (aq) A B CA CB (b) H2S (aq) + HOH (l) H3O+ (aq) + HS- (aq) A B CA CB (c) HNO3 (aq) + HOH (l) H3O+ (aq) + NO3- (aq) A B CA CB hydrogen sulfite ion = strong conjugate base hydrogen sulfide ion = strong conjugate base nitrate ion = weak conjugate base 5. Write the name and formula for the conjugate acid of each of the following bases. Is the conjugate acid strong or weak? (a) CO32(b) NH3 (c) HSO4Answer (a) CO32- (aq) + HOH (l) HCO3- (aq) + OH- (aq) B A CA CB (b) NH3 (aq) + HOH (l) NH4+ (aq) + OH- (aq) B A CA CB (c) HSO4- (aq) + HOH (l) H2SO4 (aq) + OH- (aq) B A CA CB hydrogen carbonate ion = weak conjugate acid ammonium ion = weak conjugate acid sulfuric acid = strong conjugate acid PAGE 2 OF 3 ACID BASE WORKSHEET ANSWER KEY GENERAL CHEMISTRY 6. H2PO4- is amphoteric. Write equations that demonstrate both its acidic and basic nature. Register to View AnswerH2PO4- (aq) + HOH (l) HPO42- (aq) + H3O+ (aq) A B CB CA (b) H2PO4- (aq) + HOH (l) H3PO4 (aq) + OH- (aq) B A CA CB PAGE 3 OF 3

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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
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Irvine Valley College - PHYS 4A - 60865
Irvine Valley College - PHYS 4A - 60865
Irvine Valley College - PHYS 4A - 60865
Irvine Valley College - PHYS 4A - 60865