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Ksp= [Mg2+] [2OH-]^2
4.10^-12 = S . (2S)^2
4.10^-12 = 4S^3
S= 10^-4
OH-= 2S = 2.10^-4
pOH= -log[OH-]
pOH= -log 2.10^-4
pOH= 4-log 2
pH= 10+log 2