Equilibrium ❮ 233❯ Review Questions
Use these questions to review the content of this chapter and practice for the AP Chemistry
exam. First are 28 multiple-choice questions similar to what you will encounter in Section I
of the AP Chemistry exam. Following those is a long free-response question like the ones
in Section II of the exam. To make these questions an even more authentic practice for the
actual exam, time yourself following the instructions provided.Multiple-Choice Questions
Answer the following questions in 45 minutes. You may not use a calculator. You may use
the periodic table and the equation sheet at the back of this book.- A 0.1 molar solution of acetic acid, CH 3 COOH,
has a pH of about:
(A) 1
(B) 3
(C) 7
(D) 10 - Acid Ka, acid dissociation constant
H 3 PO 4 7.2 × 10 -^3
H 2 PO 4 - 6.3 × 10 -^8
HPO 42 - 4.2 × 10 -^13
Using the given information, choose the best
answer for preparing a buffer with a pH of 8.
(A) K 2 HPO 4 + KH 2 PO 4
(B) H 3 PO 4
(C) K 2 HPO 4 + K 3 PO 4
(D) K 3 PO 4
Use the following information for questions 3–4.
Acid/Base Ionization Constants
HCOOH Kb = 1.8 × 10 -^4
CH 3 NH 2 Kb = 4.4 × 10 -^4
H 3 PO 2 Ka1 = 3 × 10 -^2
Ka2 = 1.7 × 10 -^7
- Which of the following is a solution with an ini-
tial KCOOH concentration of 1 M and an initial
K 2 HPO 2 concentration of 1 M?
(A) a solution with a pH > 7, which is a buffer
(B) a solution with a pH < 7, which is not a
buffer
(C) a solution with a pH < 7, which is a buffer
(D) a solution with a pH > 7, which is not a
buffer
4. Which of the following is a solution with an ini-
tial H 3 PO 2 concentration of 1 M and an initial
KH 2 PO 2 concentration of 1 M?
(A) a solution with a pH > 7, which is a buffer
(B) a solution with a pH < 7, which is not a
buffer
(C) a solution with a pH < 7, which is a buffer
(D) a solution with a pH > 7, which is not a
buffer
5. A solution of a weak base is titrated with a solu-
tion of a standard strong acid. The progress of
the titration is followed with a pH meter. Which
of the following observations would occur?
(A) The pH of the solution gradually decreases
throughout the experiment.
(B) Initially the pH of the solution drops slowly,
and then it drops much more rapidly.
(C) At the equivalence point, the pH is 7.
(D) After the equivalence point, the pH becomes
constant because this is the buffer region.
6. What is the ionization constant, Ka, for a weak
monoprotic acid with a 0.30 molar solution
having a pH of 4.0?
(A) 3.3 × 10 -^8
(B) 4.7 × 10 -^2
(C) 1.7 × 10 -^6
(D) 3.0 × 10 -^4
7. Phenol, C 6 H 5 OH, has Ka = 1.0 × 10 -^10. What is
the pH of a 0.010 M solution of phenol?
(A) between 3 and 7
(B) 10
(C) 2
(D) between 7 and 10