A mixture contains Ni and Mg

CHEMISTRY · Subjective · AP · Chemistry · Equilibrium · Equilibrium

Problem

A mixture contains Ni2+^{2+} and Mg2+^{2+}, each at 0.010 M. The solubility products are Ksp(Ni(OH)2)=6.0×10−16K_{sp}(\text{Ni(OH)}_2)=6.0\times10^{-16} and Ksp(Mg(OH)2)=5.6×10−12K_{sp}(\text{Mg(OH)}_2)=5.6\times10^{-12} at 25 °C. As NaOH is slowly added, which metal hydroxide precipitates first, and at what pH does precipitation start? Provide both the identity and the pH (two décimal places).

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