Gen. Chemistry - Chap. 16
Choose the correct answer for each question.
 

1The Ksp expression for Fe(OH)3 (s) would be...
[Fe3+] [OH-]
[Fe3+] [OH-]3
[Fe3+] [OH-] / [Fe(OH)3]
[Fe3+] [OH-]3 / [Fe(OH)3]

2Which of the following salts is MOST soluble in H2O?
BaF2 Ksp = 1.8 x 10-7
CaF2 Ksp = 1.5 x 10-10
MgF2 Ksp = 7.0 x 10-11
PbF2 Ksp = 7.1 x 10-7

3What is the [Pb2+] in a solution in equilibrium with PbBr2 if the [Br-] = 0.03 M? (Ksp PbBr2 = 7.9 x 10-5)
0.088 M
2.37 x 10-6 M
7.1 x 10-8 M
0.35 M

450.0 mL of 0.002 M MgCl2 is mixed with 50 mL of 0.004 M Na2CO3. What, if anything will happen? Ksp MgCO3 = 6.8 x 10-6
NaCl precipitates
A precipatate of MgCO3 will form.
No precipitate will form.
The solution becomes acidic.

5Calculate the solubility of Cu2S in pure water. (Ksp Cu2S = 2.0 x 10-47)
3.16 x 10-24 M
2.16 x 10-16 M
2.0 x 10-47 M
1.71 x 10-16 M

6Calculate the solubility of Cu2S in 0.001 M Na2S. (Ksp Cu2S = 2.0 x 10-47)
2.0 x 10-47 M
7.07 x 10-23 M
1.71 x 10-16 M
3.34 x 10-8 M