Chemical Equilibria Worksheet

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Chemist’s Daily
Chapter 16 - Ksp
1. Write out the Ksp and equilibrium expression for:
PbCO
Pb
2+
+ CO
2-
PbCO
3
3
3
Ksp = [Pb
2+
] [CO
2-
]
3
Ag
S
2 Ag
+
+ S
2-
Ag
S
2
2
Ksp = [Ag
+
]
2
[S
2-
]
Ca(OH)
Ca
2+
+ 2 OH
-
Ca(OH)
2
2
Ksp = [Ca
] [OH
]
2+
-
2
2. Calculate the molar solubility of copper(I) iodide.
Looking in your appendix, Ksp (CuI) = 1 x 10
-12
CuI
Cu
+
+ I
-
Ksp = [Cu
+
] [I
-
]
1x 10
-12
= (x) (x) = x
2
x = 1 x 10
-6
So the molar solubility is 1 x 10
-6
3. The molar solubility of silver sulfate is 1.5 x 10
-2
M. What is the Ksp for this salt?
Ag
SO
2 Ag
+
+ SO
2-
2
4
4
1.5 x 10
-2
mols of silver sulfate can dissolve per liter. This leads to:
[Ag
+
] = 2 (1.5 x 10
-2
) = 3.0 x 10
-2
M
[SO
2-
] = 1.5 x 10
-2
M
4
Ksp = [Ag
+
]
2
[SO
2-
] = (3.0 x 10
-2
M)
2
(1.5 x 10
-2
M) = 1.4 x 10
-5
4

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