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Question 16.10: Write the equilibrium-constant expression for the solubility......

Write the equilibrium-constant expression for the solubility product of silver chromate, Ag_{2}CrO_{4}.

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STRATEGY AND SOLUTION

First write the balanced equation for the solubility equilibrium:

Ag_{2}CrO_{4}(s)\xrightleftharpoons{}2  Ag^{+}(aq)+CrO_{4}  ^{2-}(aq)

The exponents in the equilibrium-constant expression for K_{sp} are the coefficients in the balanced equation. Therefore,

K_{sp} = [Ag^{+}]^{2}[CrO_{4}  ^{2-}]

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