MgOH <===> Mg 2+ + OH¯
Ksp = [Mg2+] [OH¯]
5.6 x 10^-12= (2x)(x)
x = 1.7 x 10^-6 M (this is the [OH¯])
pOH = - log [OH¯] = - log 1.7 x 10^-6 = 1
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