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pH= 9 --> pOH = 5 --> [OH-]= 10^-5
Mg(OH)2 ⇄ Mg2+ + 2OH-
5x 10^-6 10^-5
Ksp = [Mg2+] [OH-]^2
= [5 x 10^-6] [10^-5]^2
= 5 x 10^-16