1. 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

2. 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

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

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

5. The pH of a 0. 200 M weak acid is found to be 3
The pH of a 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

6. The pH of a 0. 200 M weak acid is found to be 3
The pH of a 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

7. 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

8. 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

9. 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

10. 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

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

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

13. 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

14. 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

15. 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

16. 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

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

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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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