The pH at which Mg( OH)_2[ K_ sp=1 x 10^-11] begins to precipitate from a solution containing 0.10 M Mg^2+ ions is __________.

Precipitation when Q_s p=K_s p \ [ Mg^2+][ OH^-]^2=10^-11 \ 0.1 x [ OH^-]^2=10^-11 => [ OH^-]=10^-5 \ => pOH=5 => pH=9 \

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The pH at which MgOH2Ksp1 x 1011 begins to precipitate ... | (Chemistry) | DivineJEE

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Chemistry

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Chemistry

The $\mathrm{pH}$ at which $\mathrm{Mg}(\mathrm{OH})_2\left[\mathrm{~K}_{\mathrm{sp}}=1 \times 10^{-11}\right]$ begins to precipitate from a solution containing $0.10 \mathrm{~M} \mathrm{~Mg}^{2+}$ ions is __________.

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Explanation

$\begin{aligned} & \text { Precipitation when } Q_{s p}=K_{s p} \\ & {\left[\mathrm{Mg}^{2+}\right]\left[\mathrm{OH}^{-}\right]^2=10^{-11}} \\ & 0.1 \times\left[\mathrm{OH}^{-}\right]^2=10^{-11} \Rightarrow\left[\mathrm{OH}^{-}\right]=10^{-5} \\ & \Rightarrow \mathrm{pOH}=5 \quad \Rightarrow \mathrm{pH}=9 \end{aligned}$