Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
solubility of SrSO4 in water is 0.107 g in 1.0 L at 25 °C. What is the
value of Ksp for SrSO4? a. | 3.4
ｘ
10-7 | b. | 5.8ｘ 10-4 | c. | 1.2
ｘ
10-3 | d. | 1.1
ｘ 10-2 | e. | 2.1
ｘ
10-1 | | |
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2.
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The
Ksp of PbBr2 is 6.6
ｘ 10-6 at 25 °C. What is the
concentration of Br- in a saturated solution of PbBr2(aq)? a. | 2.6
ｘ 10-3
M | b. | 1.2
ｘ 10-2
M | c. | 1.9
ｘ 10-2
M | d. | 2.4
ｘ 10-2
M | e. | 3.8
ｘ 10-2
M | | |
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3.
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The
Ksp of CaSO4 is 4.9
ｘ 10-5 at 25 °C. What is the
concentration of Ca2+ in a saturated solution of CaSO4? a. | 2.4
ｘ 10-9
M | b. | 2.5
ｘ 10-5
M | c. | 4.9
ｘ 10-5
M | d. | 7.0
ｘ 10-3
M | e. | 3.7
ｘ 10-2
M | | |
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4.
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What
is the molar solubility of Ag2CrO4 in 0.0050 M K2CrO4 at
25 °C? The value of
Ksp for Ag2CrO4 is 5.4
ｘ
10-12 at 25 °C. a. | 1.6
ｘ 10-5 mol/L | b. | 2.2
ｘ 10-5
mol/L | c. | 3.3
ｘ 10-5 mol/L | d. | 6.6
ｘ 10-5
mol/L | e. | 1.1
ｘ 10-4 mol/L | | |
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5.
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At 25
°C, only 1.04 mg
Cu(NO3)2 will dissolve per liter of a solution that is buffered at pH 6.80.
What is the value of Ksp for Cu(OH)2? The molar mass of
Cu(NO3)2 is 187.6 g/mol. a. | 2.2
ｘ 10-20 | b. | 1.4
ｘ
10-19 | c. | 4.1
ｘ 10-18 | d. | 3.5
ｘ
10-13 | e. | 8.8
ｘ10-13 | | |
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6.
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What
is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.75 at 25
°C? The
Ksp of Fe(OH)3 is 6.3 ´ 10-38 at 25 °C. a. | 1.1 ´
10-29 mol/L | b. | 1.1 ´ 10-26 mol/L | c. | 2.0 ´
10-15 mol/L | d. | 2.2 ´ 10-10 mol/L | e. | 3.5 ´ 10-4
mol/L | | |
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7.
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The
concentration of Ca2+ in an aqueous solution is 2.2 ´ 10-3
M. What concentration of CO32- is required to begin precipitating
CaCO3? The Ksp of CaCO3 is 3.4 ´
10-9. a. | 7.5
ｘ
10-12 M | b. | 1.5
ｘ 10-6 M | c. | 5.8
ｘ 10-5
M | d. | 7.0
ｘ10-4
M | e. | 2.7
ｘ 10-2
M | | |
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8.
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What
mass of Na2SO4 (molar mass = 142.0 g/mol) must be added to 350 mL of 0.16 M
Ag+ to initiate precipitation of Ag2SO4? The Ksp
of Ag2SO4 is 1.2
ｘ 10-5. Assume no volume change occurs upon addition of
Na2SO4. a. | 4.7
ｘ 10-4 g | b. | 3.7
ｘ 10-3
g | c. | 1.1
ｘ 10-2
g | d. | 2.3
ｘ 10-2
g | e. | 6.7
ｘ 10-2
g | | |
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9.
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The
following anions can be separated by precipitation as silver salts: Cl-, Br-,
I-, CrO42-. If Ag+ is added to a solution containing the
four anions, each at a concentration of 0.10 M, in what order will they
precipitate?
Compound | K sp | AgCl | 1.8
ｘ 10 -10 | Ag 2 CrO 4 | 1.1
ｘ
10-12 | AgBr | 5.4
ｘ 10 -13 | AgI | 8.5
ｘ10 -17 | | |
a. | AgCl → Ag2CrO4
→ AgBr
→
AgI | b. | AgI
→ AgBr
→
Ag2CrO4 → AgCl | c. | Ag2CrO4
→
AgCl
→ AgBr
→
AgI | d. | Ag2CrO4 →AgI → AgBr → AgCl | e. | AgI →
AgBr → AgCl →Ag2CrO4 | | |
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10.
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Consider the reaction
Zn(OH)2(s) + 2 OH-(aq) ⇌
Zn(OH)42-(aq) K = 8.7
ｘ 10-2
If Ksp for Zn(OH)2 is 3.0
ｘ
10-17, what is the value of the formation constant, Kform, for the
reaction below?
Zn2+(aq) + 4 OH-(aq)
⇌
Zn(OH)42-(aq)
a. | 2.6
ｘ 10-18 | b. | 3.4
ｘ
10-16 | c. | 2.9
ｘ 1015 | d. | 3.3
ｘ
1016 | e. | 3.8
ｘ 1017 | | |
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