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Acid and Base Chemistry - Concentrations

1. Given the following table of Ksp values, determine which compound
listed has the smallest solubility.
compound Ksp

CdCO3 5.2 x 10-12
Cd(OH)2 2.5 x 10-14
AgI 8.3 x 10-17
Fe(OH)3 4 x 10-38
ZnCO3 1.4 x 10-11

a. Cd(OH)2
b. AgI
c. Fe(OH)3
d. ZnCO3
e. CdCO3

2. The solubility of which one of the following will not be affected by
the pH of the solution?

a. Na3PO4
b. MnS
c. NaF
d. AlCl3
e. KNO3

3. Calculate the molar solubility of silver carbonate (Ksp = 6.15 x
10-12).

a. 1.15 x 10-4
b. 6.20 x 10-7
c. 2.48 x 10-6
d. 2.33 x 10-4
e. 1.24 x 10-6

4. What is the molar solubility of PbS? Ksp(PbS) = 8.0 x 10-28

a. 8.0 x 10-28
b. 6.4 x 10-55
c. 4.0 x 10-28
d. 8.0 x 10-19
e. 2.8 x 10-14

5. The solubility of Mn(OH)2 is 2.2 x 10-5 mol/L. What is the Ksp of
Mn(OH)2?

a. 2.2 x 10-5
b. 4.8 x 10-10
c. 4.3 x 10-14
d. 2.1 x 10-14
e. 1.1 x 10-14

6. What is the maximum concentration (in M) of chloride ions in a
solution that contains 0.100 M Pb2+? The Ksp for lead(II) chloride
is 1.0 x 10-4.

a. 0.058
b. 0.029
c. 0.032
d. 0.0.0010
e. 1.0 x 10-4

Solution Preview

1. Given the following table of Ksp values, determine which compound
listed has the smallest solubility.
compound Ksp

CdCO3 5.2 x 10-12
Cd(OH)2 2.5 x 10-14
AgI 8.3 x 10-17
Fe(OH)3 4 x 10-38
ZnCO3 1.4 x 10-11

a. Cd(OH)2
b. AgI
c. Fe(OH)3
d. ZnCO3
e. CdCO3

Solution:
The answer is (c).

CdCO3  Cd2+ + CO32-
Ksp = [Cd2+] [CO32-] = 5.2 × 10-12
x2 = 5.2 × 10-12
x = 2.28 × 10-6
Solubility of CdCO3 = 2.28 × 10-6 M

Cd(OH)2  Cd2+ + 2 OH-
Ksp = [Cd2+] [OH-]2 = 2.5 ×10-14
(x) (2x)2 = 2.5 × 10-14
4x3 = 2.5 × 10-14
x = 1.84 × 10-5
Solubility of Cd(OH)2 = ...

Solution Summary

The solubility and concentration of different compounds are determined. Acid and base chemistry is analysed.

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