Chemistry

Problem

The solubility-product constants at 25 °C are CaSO

_4

K_{sp}=7.1\times10^{-5}

CaF

_2

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

What is the approximate ratio

\dfrac{s_{\text{CaSO}_4}}{s_{\text{CaF}_2}}

of the molar solubilities of the two salts in pure water? a)

1.4\times10^{3}

4\times10^{-1}

4\times10^{1}

2.4\times10^{1}