Question 17.SE.10: Write the expression for the solubility-product constant for...

Chemistry: The Central Science in SI Units, Expanded Edition

Write the expression for the solubility-product constant for CaF $_2$ , and look up the corresponding K $_{sp}$ value in Appendix D.

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Analyze We are asked to write an equilibrium expression for the process by which CaF $_2$ dissolves in water.

Plan We apply the general rules for writing an equilibrium-constant expression, excluding the solid reactant from the expression. We assume that the compound dissociates completely into its component ions:

$CaF _2(s) \rightleftharpoons Ca ^{2+}(a q)+2 F ^{-}(a q)$

Solve The expression for K $_{sp}$ is

$K_{s p}=\left[ Ca ^{2+}\right]\left[ F ^{-}\right]^2$

Appendix D gives 3.9 × 10 $^{-11}$ for this K $_{sp}$ .

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