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# Determining Precipitation from Hard Water with Change in pH

CHEM-WLHMHD

The term “hard water” describes water that contains relatively high concentrations of alkaline earth metal ions. A sample of hard water that contains $2.5\times 10^{-5} \textrm{ M Mg}^{2+}$ has the pH raised to $10.80$.

Will $\textrm{Mg(OH)}_2$ precipitate?

$K_{sp}$ of $\textrm{Mg(OH)}_2$ is $1.8\times10^{-11}$.

A

$\textrm{Mg(OH)}_2$ will precipitate.

B

$\textrm{Mg(OH)}_2$ will not precipitate.

C

Not enough information is provided.