What is the $\left[{\mathrm{Mg}}^{2+}\right]\text{ in }0.10 \mathrm{M} \mathrm{NaF}$  that is saturated with ${\mathrm{MgF}}_2$ at ${25}^{\circ }\mathrm{C}$?

${\mathit{K}}_{sp}$
${\mathrm{MgF}}_2$	$6.4\times {10}^{-9}$

 

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