Question 12.EP.10: Write the solubility product constant expression for calcium...

Write the solubility product constant expression for calcium fluoride.

Strategy
Identify the formula for the salt, and write the chemical equation that represents the solubility equilibrium. Write the solubility product constant expression based on the chemical equation.

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Because fluorine forms a 1− ion and calcium forms a 2+ ion, calcium fluoride is CaF_{2}.

CaF_{2}(s)\rightleftarrows Ca^{2+}(aq)+2 \ F^{-}(aq)

so,

K_{sp} = [Ca^{2+}][F^{-}]^{2}

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