CHEMISTRY AN INTRODUCTION TO GENERAL, ORGANIC, AND BIOLOGICAL CHEMISTRY CRS “Clicker” Questions Chapter 8 Acids and Bases Eleventh Edition Nancy Gardner

CHAPTER 8: ACIDS AND BASES 8.1 A Brønsted–Lowry acid is a proton donor. Which of the following compounds is NOT a Brønsted–Lowry acid? A. HBr B. NH4+ C. H3PO4 D. Ca(OH)2 Answer: D

CHAPTER 8: ACIDS AND BASES 8.2 Which of the following is the correct equation for the dissociation of a weak acid in water? A. HNO2 + H2O  H3O+ + NO2– B. H2SO4 + H2O  H3O+ + HSO4– C. HCl + H2O  H3O+ + Cl– D. HCl + H3O+  H2O+ Cl– Answer: A

CHAPTER 8: ACIDS AND BASES 8.3 Use the ion product of water to calculate the OH– concentration of an aqueous solution with an [H3O+] of 6.1 × 10–4 M. A. 7.9 × 10–11 M B. 6.1 × 10–11 M C. 1.6 × 10–11 M D. 6.1 × 10–18 M Answer: C

CHAPTER 8: ACIDS AND BASES 8.4 Which of the following solutions is not acidic? A. coffee, pH 5.5 B. shampoo, pH 5.7 C. rain, pH 5.8 D. blood, pH 7.38 Answer: D

CHAPTER 8: ACIDS AND BASES 8.5 Give the coefficients for the neutralization of the weak acid H3PO4 by Ca(OH)2. ___H3PO4 + ___Ca(OH)2  ___Ca3(PO4)2 + ___H2O A. 1, 1, 1, 2 B. 2, 3, 1, 6 C. 3, 2, 1, 6 D. 2, 3, 6, 1 Answer: B

CHAPTER 8: ACIDS AND BASES 8.6 Which of the following is a buffer system? A. NaOH and NaCl B. HF and KF C. KCl and NaCl D. Ca(OH)2 and MgCl2 Answer: B

CHAPTER 8: ACIDS AND BASES 8.7 Which of the following is NOT a conjugate acid-base pair? A. HCl and Cl– B. HNO2 and HNO3 C. H3PO4 and H2PO4– D. HCN and CN– Answer: B

CHAPTER 8: ACIDS AND BASES 8.8 Which of the following is nitrous acid? A. HNO4 B. HNO3 C. HNO2 D. HNO Answer: C

CHAPTER 8: ACIDS AND BASES 8.9 Identify the conjugate base in the following equation. HCl(aq) + Na2CO3(aq) Na+(aq) + Cl–(aq) + HCO3–(aq) A. Na+ B. Cl– C. HCO3– D. HCl Answer: B 10

CHAPTER 8: ACIDS AND BASES 8.10 Which of the following acids is a strong acid? A. HBr B. HNO2 C. H3PO4 D. HCN Answer: A

CHAPTER 8: ACIDS AND BASES 8.11 The [OH–] of a solution is 3.6 × 10–4 M. What is the corresponding [H3O+]? A. 3.6 × 1010 M B. 2.8 × 10–11 M C. 2.8 × 10–10 M D. 3.6 × 10–11 M Answer: B 12

CHAPTER 8: ACIDS AND BASES 8.12 The [H3O+] of a solution is 6.7 × 10–8 M. What is the pH of the solution? A. 7.17 B. 7.2 C. 7.0 D. 6.83 Answer: A 13

CHAPTER 8: ACIDS AND BASES 8.13 How many mL of a 0.525 M NaOH solution is needed to neutralize 15.00 mL of a 1.25 M H2SO4 solution? A. 35.7 mL B. 71.4 mL C. 9.84 mL D. 6.30 mL Answer: B 14

CHAPTER 8: ACIDS AND BASES 8.14 A solution of 35.0 mL of Ca(OH)2 is neutralized with 43.5 mL of 0.635 M H3PO4. What is the molarity of the Ca(OH)2 solution? A. 0.526 M B. 0.766 M C. 0.789 M D. 1.18 M Answer: D 15

CHAPTER 8: ACIDS AND BASES 8.15 Sometimes during stress or trauma, a person can start to hyperventilate. What change occurs in the blood pH during hyperventilation? A. hyperventilation increases the CO2 level in the blood B. hyperventilation lowers the blood pH C. hyperventilation increases the H2CO3 D. hyperventilation lowers the CO2 level in the blood Answer: D