What is Sparingly Soluble Compound

In this chapter, original methods for determining thermodynamic properties such as the equilibrium activity product or solubility product of sparingly soluble compounds and the stability constants of complexes are described. Methods for determining concentration product and solubility are based solely on pH measurements of the saturated aqueous solutions for a known initial composition of the heterogeneous mixture and the equilibrium constants of an arbitrary set of possible side reactions in the solution. In the case of sparingly soluble acids or hydroxides, the determination of the solubility (Sol) and solubility product (KS) is also possible in the presence of other acids and bases of known concentrations. Sol and KS were calculated from known experimental pH data for a series of hydroxides, acids, neutral and acidic salts MmHxAy(S), as well as basic/mixed salts Mm(OH)xAy(S) of arbitrary composition.