Cu3(AsO4)2(s) <------> 3Cu2+(aq) + 2AsO42-(aq)
Ksp = [Cu2+]3[AsO42-]2 = 7.6 ×10-36
If solubility of Cu3(AsO4)2 is S
[Cu2+] = 3S
[AsO42-] = 2S
(3S)3(2S)2 = 7.6 ×10-36
108S5 =7.6 ×10-36
S5 = 7.24× 10-38
S = 3.73 ×10-8
Therefore,
Molar solubility of Cu3(AsO4)2 = 3.73 ×10-8 M
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