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WorksheetsAP Chemistry Topic 3.9
Total questions: 16
Worksheet time: 30mins
Name
Class
Date
1.
Which of the following is a conjugate acid/base pair?
a)
HCl/OCl-
b)
H2SO4/SO42-
c)
NH4+/NH3
d)
H3O+/OH-
2.
The pH of a solution at 25ₒC in which [OH-] = 3.9 x 10-5M is:
a)
4.41
b)
3.90
c)
9.59
d)
4.80
3.
Calculate the pH of a 0.47M NH3 (Kb = 1.8 x 10-5) solution.
a)
2.54
b)
8.93
c)
5.07
d)
11.46
4.
A weak acid, HF, is in solution with dissolved sodium fluoride, NaF. If HCl is added, which ion will react with the extra hydrogen ions from the HCl to keep the pH from changing?
a)
OH-
b)
Na+
c)
F-
d)
Na-
5.
The correct mathematical expression for finding the molar solubility (s) of Sn(OH)2 is:
a)
2s2 = Ksp
b)
2s3 = Ksp
c)
4s3 = Ksp
d)
8s3 = Ksp
6.
The molar solubility of PbI2 is 1.52 x 10-3 M. Calculate the value of Ksp for PbI2.
a)
3.51 x 10-9
b)
1.40 x 10-8
c)
4.62 x 10-6
d)
1.52 x 10-3
7.
Calculate the [H+] in a solution that has a pH of 2.73.
a)
5.4 x 10-12 M
b)
1.9 x 10-3 M
c)
2.7 M
d)
11.3 M
8.
The pH at the equivalence point of the titration of a strong acid with a strong base is:
a)
3.9
b)
4.5
c)
7.0
d)
8.2
9.
When the chemical reaction A + B ↔ C+ D is at equilibrium,
a)
both the forward and reverse reactions have stopped.
b)
the sum of the concentrations of A and B equals the sum of the concentrations of C and D.
c)
all four concentrations are equal.
d)
neither the forward nor the reverse reactions have stopped.
10.
A substance that ionizes completely in solution is
a)
an insulator.
b)
a strong electrolyte.
c)
a weak acid.
d)
a non-electrolyte.
11.
When citric acid is produced by the cells of an orange and dissolves in water, it produces a relatively small number of hydronium ions. Citric acid is best described as a
a)
concentrated acid.
b)
weak acid.
c)
dilute acid.
d)
strong acid.
12.
Which is the weakest acid?
a)
HF
b)
HNO2
c)
CH3COOH
d)
HClO
13.
Which of the following correctly describes the strengths of the acids in solution?
a)
HA and HB are both examples of strong acids.
b)
HA and HB are both examples of weak acids.
c)
HA is an example of a strong acid, HB is an example of a weak acid.
d)
HA is an example of a weak acid, HB is an example of a strong acid.
14.
Which of the following acids in water would most likely result in a strongly lit light bulb that is connected to electrodes?
a)
HNO3; Ka > 1
b)
HClO2; Ka = 1.1x10-2
c)
HCH3H5O3; Ka = 1.38x10-4
d)
H2CO3; Ka = 4.3x10-7
15.
If K < Q, which part of the reaction will speed up?
a)
forward
b)
reverse
c)
none
16.
Which of the following shows the correct dissolution reaction for BaCl2?
a)
Ba 2+(aq) + Cl2-(aq) -> BaCl2(s)
b)
BaCl2(aq) -> Ba 2+(aq) + 2Cl-(aq)
c)
BaCl2(s) -> Ba 2+(aq) + 2Cl-(aq)
d)
Ba 2+(aq) + 2Cl-(aq) -> BaCl2(s)
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