THERMODYNAMICS OF SOLVATION OF IONS .5. GIBBS FREE-ENERGY OF HYDRATION AT 298.15-K

The standard molar Gibbs free energies of hydration, DELTA-hyd-G(o) of 109 (mainly inorganic) ions ranging in their charges from -3 to +4 have been compiled and interpreted in terms of a model used previously for other thermodynamic quantities of hydration. The main contributions to DELTA-hyd-G(o) are the electrostatic effects, resulting in solvent immobilization, electrostriction, and dielectric saturation in a hydration shell of specified thickness, and further such effects on the water that surrounds this shell. Other effects contribute to DELTA-hyd-G(o) to a minor extent only.