Determine the minimum concentration of fluoride ion,

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

\mathrm{F^-}

, required to initiate precipitation of

\mathrm{CaF_2}

in a

0.010\;\text{M}

\mathrm{Ca^{2+}}

solution at

25^\circ\text{C}

given that

K_{sp}(\mathrm{CaF_2}) = 3.9\times10^{-11}

. (a)

8.8\times10^{-5}\;\text{M}

(b)

6.2\times10^{-5}\;\text{M}

(c)

3.9\times10^{-9}\;\text{M}

(d)

6.2\times10^{-6}\;\text{M}