What is the molarity of F^{-} in a saturated | vedclass

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(D) The dissociation of $InF_3$ is given by: $InF_3(s) \rightleftharpoons In^{3+}(aq) + 3F^{-}(aq)$Let the solubility of $InF_3$ be $S \ M$.Then,$[In^

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$7.0 	imes 10^{-3}$

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(D) The dissociation of $InF_3$ is given by: $InF_3(s) ightleftharpoons In^{3+}(aq) + 3F^{-}(aq)$Let the solubility of $InF_3$ be $S \ M$.Then,$[In^{3+}] = S$ and $[F^{-}] = 3S$.$K_{sp} = [In^{3+}][F^{-}]^3$$7.9 	imes 10^{-10} = (S)(3S)^3$$7.9 	imes 10^{-10} = 27S^4$$S^4 = \frac{7.9 	imes 10^{-10}}{27} \approx 2.926 	imes 10^{-11}$$S = (2.926 	imes 10^{-11})^{1/4} \approx 2.32 	imes 10^{-3} \ M$The concentration of $F^{-}$ is $3S = 3 	imes 2.32 	imes 10^{-3} \ M = 6.96 	imes 10^{-3} \ M \approx 7.0 	imes 10^{-3} \ M$.

What is the molarity of $F^{-}$ in a saturated solution of $InF_3$? $(K_{sp} = 7.9 \times 10^{-10})$

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