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Solubility Product Constant (Ksp)

The equilibrium constant for the dissolution of a sparingly soluble salt, determining the maximum concentration of a solute at equilibrium.
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The statement of the theorem

Consider the dissolution equilibrium of a sparingly soluble salt AmBnA_mB_n: AmBn(s)⇌mAn+(aq)+nBm−(aq) A_mB_n(s) \rightleftharpoons m A^{n+}(aq) + n B^{m-}(aq) The Solubility Product Constant (KspK_{sp}) is defined by the activities of the dissolved ions at equilibrium: Ksp=(aAn+)m(aBm−)n K_{sp} = \left( a_{A^{n+}} \right)^m \left( a_{B^{m-}} \right)^n Assuming ideal behavior and using molar concentrations CC: Ksp=(γAn+CAn+)m(γBm−CBm−)n K_{sp} = (\gamma_{A^{n+}} C_{A^{n+}})^m (\gamma_{B^{m-}} C_{B^{m-}})^n