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# Precipitation of Calcium Hydroxide from a Mixture

CHEM-WYXH@D

$\textrm{NaOH}_{(aq)}$ is added dropwise to a solution of $5.5\times10^{-2} \textrm{ M Ca(NO}_3\textrm{)}_2$ until a precipitate forms.

Which of the following statements best explains when a precipitation of $\textrm{Ca(OH)}_{2(s)}$ will begin?

$K_{sp}$ for $\textrm{Ca(OH)}_2=5.5\times10^{-6}$.

Assume no volume change with the addition of $\textrm{NaOH}$.

A

When the concentration of $\textrm{NaOH}$ is just a little over $3.0\times10^{-7}\textrm{ M}$, precipitation will begin.

B

When the concentration of $\textrm{NaOH}$ is just a little over $1.0\times10^{-4}\textrm{ M}$, precipitation will begin.

C

When the concentration of $\textrm{NaOH}$ is just a little over $1.0\times10^{-2} \textrm{ M}$, precipitation will begin.

D

When the concentration of $\textrm{NaOH}$ is just a little over $2.0\times10^{-2}\textrm{ M}$, precipitation will begin.