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pOh = 14-9=5
[OH-] = 10^-5
X(OH)2 --> X2+ + 2OH-
1/2x10^-5 10^-5
Ksp X(OH)2 = [X2+] [OH- ]^2
=[1/2x10^-5] [10^-5]^2
=[1/2x10^-5] [10^-10]
=[1/2x10^-15]
=0,5 x 10^-15 = 5 x10^-16