Sample Problem 19.7
Calculating the effect of a common ion on solubility
initial
change
equilibrium
-
-
-
0.10
0
+S
+2S
0.10 + S
2S
Ksp = 6.5 x 10-6 = (0.10 + S)(2S)2 = (0.10)(2S)2
(S << 0.10)
S
= 4.0 x 10-3 M
Check the assumption:
x 100 = 4.0 %
_____________________________________________
(6.5 x 10-5/4)0.5
= 1.2 x 10-2 M
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