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PH = 11
POH = 14-11 = 3
OH- = 10^-3
Mg(OH)2 -----------> Mg+2 + 2OH-
s s 2s
Ksp =[s] [s]^2 = 0,5 . 10^-3 .(10^-3)^2
= 0,5 .10^-9 = 5.10^-10