Question 12.EP.2: Cyanide ions will precipitate from a solution that also cont...
Cyanide ions will precipitate from a solution that also contains silver ions, as described by the following equilibrium:
Ag^{+}(aq)+CN^{-}(aq)\rightleftarrows AgCN(s)
Write the equilibrium expression for this reaction.
Strategy
Write the equilibrium expression as before, but do not include a term for the concentration of the solid silver cyanide product.
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K=\frac{1}{[Ag^{+}][CN^{-}]}
Analyze Your Answer
This answer may seem troublesome, because there are no concentration terms in the numerator. But when we look at the reaction, we see that the only product is a solid. Because pure substances do not appear in the equilibrium constant expression, we are left with just a “1” in the numerator, and the answer is correct.
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