Acid and Base Chemistry - Concentrations
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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
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Solution Summary
The solubility and concentration of different compounds are determined. Acid and base chemistry is analysed.
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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 = ...
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