Abstract
Solubility equilibria between solid salts, salt hydrates, and water have been analyzed on a thermodynamic basis. Fitting equations with three or four adjustable parameters suffice to describe the temperature dependence of solubility adequately when the latter is expressed in ionic (species) mole fractions. Phase diagrams, temperature versus mole fractions, summarize and deal concisely with equilibrium solubility properties of the systems. Comparison of experimental and estimated ratios of slopes to liquidus curves intersecting at isobaric invariants, such as, for example, eutectic or peritectic points, provides a thermodynamic consistency test.
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