Solid ( ) is added to HCl (pH ,2.0)

CHEMISTRY · Single correct · AP · Chemistry · Acids and Bases · Acids and Bases

Problem

Solid

\text{CaF}_2

(

K_{sp}=3.9\times10^{-11}

) is added to

0.010\,\text{M}

HCl (pH\,2.0). Given that

K_a

for HF is

6.8\times10^{-4}

, what is the approximate molar solubility of

\text{CaF}_2

under these conditions? (a)

8.5\times10^{-5}\,\text{M}

(b)

1.3\times10^{-3}\,\text{M}

(c)

2.2\times10^{-4}\,\text{M}

(d)

2.7\times10^{-2}\,\text{M}