Symbol Ks. The product of the concentrations of ions in a saturated solution. For instance, if a compound AxBy is in equilibrium with its solution AxBy(s)⇌xA+(aq)+yB−(aq) the equilibrium constant is Kc=[A+]x[B−]y/[AxBy] Since the concentration of the undissolved solid can be put equal to 1, the solubility product is given by Ks=[A+]x[B−]y The expression is only true for sparingly soluble salts. If the product of ionic concentrations in a solution exceeds the solubility product, then precipitation occurs.
Subjects: Chemistry — Earth Sciences and Geography.