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General Chemistry

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Effect of pH on Solubility of Calcium Fluoride

CHEM-W06ED1

How would a decreased pH affect the solubility of $\textrm{CaF}_2$?

Select the BEST choice.

A

Solubility of $\textrm{CaF}_2$ would decrease because there is already a high concentration of $\textrm{H}^+$ ions and adding more positive ions with the dissolution of $\textrm{CaF}_2$ (in the form of $\textrm{Ca}^{2+}$) is unfavorable.

B

Solubility of $\textrm{CaF}_2$ decreases because the formation of some $\textrm{HF}$ makes the solution even more acidic which is unfavorable.

C

Solubility of $\textrm{CaF}_2$ would increase because $\textrm{F}^-$ interacts with the $\textrm{H}^+$ to make $\textrm{HF}$, reducing the $\textrm{F}^-$ concentration.

D

Solubility of $\textrm{CaF}_2$ would increase because acids are corrosive and always dissolves more than water.