Which of the following best describes an Arrhenius base? proton donor proton acceptor produces H+ in water produces OH− in water electron donor Answer: d

Which of the following best describes an Arrhenius base? proton donor proton acceptor produces H+ in water produces OH− in water electron donor Answer: d

Which of the following is amphoteric? SO42− HCl H2O NH4+ None are amphoteric. Answer: c

Which of the following is amphoteric? SO42− HCl H2O NH4+ None are amphoteric. Answer: c

The pH of a 0. 200 M weak acid is found to be 3 The pH of a 0.200 M weak acid is found to be 3.5, what is the Ka of the acid? HA ⇌ H+ + A− 5.00 × 10–7 61.3 1.58 × 10–4 1.58 × 10–15 1.63 × 10–2 Answer: a

The pH of a 0. 200 M weak acid is found to be 3 The pH of a 0.200 M weak acid is found to be 3.5, what is the Ka of the acid? HA ⇌ H+ + A− 5.00 × 10–7 61.3 1.58 × 10–4 1.58 × 10–15 1.63 × 10–2 Answer: a

Which of the following is not a conjugate acid/base pair? SO42– / HSO4– HC2H3O2 / C2H3O2– HO– / H3O+ H2SO3 / HSO3– All are conjugate acid/base pairs. Answer: c

Which of the following is not a conjugate acid/base pair? SO42– / HSO4– HC2H3O2 / C2H3O2– HO– / H3O+ H2SO3 / HSO3– All are conjugate acid/base pairs. Answer: c

Which of the following acids has the largest Ka? Acid I Acid II Acid III Acid I Acid II Acid III All have the same Ka. Not possible to compare Answer: c

Which of the following acids has the largest Ka? Acid I Acid II Acid III Acid I Acid II Acid III All have the same Ka. Not possible to compare Answer: c

Which of the following is a weak acid? H2SO4 HCl HBr HF All are strong acids. Answer: d

Which of the following is a weak acid? H2SO4 HCl HBr HF All are strong acids. Answer: d

What is the Kw of pure water at 50.0°C if the pH is 6.630? H2O (l) + H2O(l) ⇌ H3O+(aq) + OH−(aq) 1.0 × 10–14 2.34 × 10–7 5.50 × 10–14 2.13 × 10–14 There is not enough information to solve. Answer: c

What is the Kw of pure water at 50.0°C if the pH is 6.630? H2O (l) + H2O(l) ⇌ H3O+(aq) + OH−(aq) 1.0 × 10–14 2.34 × 10–7 5.50 × 10–14 2.13 × 10–14 There is not enough information to solve. Answer: c

Aspirin is a weak acid with a Ka = 3. 16 × 10–4 Aspirin is a weak acid with a Ka = 3.16 × 10–4. What is the pH of a solution that is 0.25 M in aspirin? 0.60 11.94 3.50 2.05 2.58 Answer: d

Aspirin is a weak acid with a Ka = 3. 16 × 10–4 Aspirin is a weak acid with a Ka = 3.16 × 10–4. What is the pH of a solution that is 0.25 M in aspirin? 0.60 11.94 3.50 2.05 2.58 Answer: d

What is the percent ionization of a 0. 250 M acetic acid solution What is the percent ionization of a 0.250 M acetic acid solution? Ka = 1.75 × 10–5 0.209 % 0.837 % 1.67 % 7.00 × 10–3 % 123 × 10–7 % Answer: b

What is the percent ionization of a 0. 250 M acetic acid solution What is the percent ionization of a 0.250 M acetic acid solution? Ka = 1.75 × 10–5 0.209 % 0.837 % 1.67 % 7.00 × 10–3 % 123 × 10–7 % Answer: b

What is the pH of a 0.116 M solution of Ba(OH)2? 8.62 13.06 13.37 0.63 12.56 Answer: c

What is the pH of a 0.116 M solution of Ba(OH)2? 8.62 13.06 13.37 0.63 12.56 Answer: c

Sodium benzoate is a common food preservative. What is the pH of a 0 Sodium benzoate is a common food preservative. What is the pH of a 0.25 M solution of sodium benzoate? pKa (benzoic acid) = 4.19 5.21 8.79 2.40 11.60 13.40 Answer: b

Sodium benzoate is a common food preservative. What is the pH of a 0 Sodium benzoate is a common food preservative. What is the pH of a 0.25 M solution of sodium benzoate? pKa (benzoic acid) = 4.19 5.21 8.79 2.40 11.60 13.40 Answer: b

Which of the following is a basic salt? NaCl NH4Cl KF a, b, and c are all acidic. a, b, and c are all basic. Answer: c

Which of the following is a basic salt? NaCl NH4Cl KF a, b, and c are all acidic. a, b, and c are all basic. Answer: c

d) The relative values of Ka1 and Ka2 cannot be predicted. Which of the following is true regarding the Ka values of a diprotic acid? a) Ka1 < Ka2 b) Ka1 = Ka2 c) Ka1 > Ka2 d) The relative values of Ka1 and Ka2 cannot be predicted. Answer: c

d) The relative values of Ka1 and Ka2 cannot be predicted. Which of the following is true regarding the Ka values of a diprotic acid? a) Ka1 < Ka2 b) Ka1 = Ka2 c) Ka1 > Ka2 d) The relative values of Ka1 and Ka2 cannot be predicted. Answer: c

A 0.10 M solution of which of the following would have the lowest pH? All have the same pH. Not possible to determine Answer: c

A 0.10 M solution of which of the following would have the lowest pH? All have the same pH. Not possible to determine Answer: c