Identify equation for Keq

Question

Identify the equation for which Keq = [Ag+][CrO₄^2-]

Answer 1

There is no equation for which Keq = [Ag⁺][CrO₄^2-]. The reason being that Ag has a +1 and CrO₄ has a -2, so this can't be. The compound that gives rise to Ag⁺ and CrO₄^2- would be Ag₂CrO₄ (silver chromate).

Then the equation would be Ag₂CrO₄(s) <==> 2Ag⁺(aq) + CrO₄^2-(aq)

Keq = [Ag⁺]²[CrO₄^2-] = Ksp