The equilibrium constant for dissolving the insoluble substance gold (I) iodide, AuI (s), in aqueous solution is 1.6 × 10^-23 at 25ºC. Write the equilibrium constant expression and calculate the concentration of Au + (aq) and I (aq) ions in a solution in which 0.345g of AuI(s) is in equilibrium with the aqueous ions. The answer is 4x10^-12.
So 1.6x10^-23=products/reactants. The products = x^2, but what does the reactant equal to? I think they got the answer by ignoring the reactants, is this possible?