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# Precipitation of Magnesium Fluoride

$K_{sp}$ for $MgF_{2}$ is $8.0 \times 10^{-8}$.

What is the maximum fluoride concentration that can be present in solution of $0.20 \ \text{M} \ Mg^{2+}$ without precipitating $MgF_{2}$?

A

$4.0 \times 10^{-7}$

B

$3.16 \times 10^{-4}$

C

$4.47 \times 10^{-4}$

D

$6.32 \times 10^{-4}$