Name:    Practice Test - Solubility Product

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.

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

2.

The Ksp of PbBr2 is 6.6 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

3.

The Ksp of CaSO4 is 4.9 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

4.

What is the molar solubility of Ag2CrO4 in 0.0050 M K2CrO4 at 25 °C? The value of Ksp for Ag2CrO4 is 5.4 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

5.

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

6.

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

7.

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

8.

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 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

9.

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

10.

Consider the reaction

Zn(OH)2(s) + 2 OH-(aq)   Zn(OH)42-(aq) K = 8.7 10-2

If Ksp for Zn(OH)2 is 3.0 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