The molar solubility (in mol litre−1) of a sparingly soluble salt MX4 is S. The corresponding solubility product Ksp is given by the relation:
The molar solubility (molL−1) of a sparingly soluble salt MX4 is ′S′. The corresponding solubility product is KSP . ′S′ is given in terms of KSP by the relation