The magnesium and calcium ions present in seawater have the following concentrations: [Mg2+] = 059 M and [Ca2+] = 0.011 M. The ions can be separated by precipitation with KOH. At what pH will the selective precipitation of Mg2+ ion be triggered? Ksp(Mg(OH)2 = 2.06 x 10-13        Ksp(Ca(OH)2 = 4.68 x 10-6

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