The solubility of solid ZnCO3 is enhanced in acid, due to the reaction of carbonate with acid.
a) What is the equilibrium constant for the reaction of solid ZnCO3 with acid? (Note: in the balanced equation for this process, you only need one mole of acid to react with the one mole of carbonate in the solid.) Report your answer to three significant figures. = 2.13
b) Using the equilibrium constant in part a, what is the molar solubility of ZnCO3 at pH = 4? Report your answer to three significant figures.