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CaSO4 ⇔ Ca2+ + SO4 2-
s s
Ksp = s^2
s = √Ksp
B. Ni3(AsO4)2
Ni3(AsO4)2 ⇔ 3Ni2+ + 2AsO4 3-
3s 2s
Ksp = (3s)^3 (2s)^2
Ksp = (27s^3) (4s^2)
Ksp = 108s^5
s = Akar pangkat lima Ksp/108