Thermodynamics of solvation of ions. Part 5.—Gibbs free energy of hydration at 298.15 K

The standard molar Gibbs free energies of hydration, ΔhydG°, 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 ΔhydG° 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 ΔhydG° to a minor extent only.