Chemistry

Problem

A mixture contains Ni

^{2+}

and Mg

^{2+}

, each at 0.010 M. The solubility products are

K_{sp}(\text{Ni(OH)}_2)=6.0\times10^{-16}

and

K_{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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