Estimation of thermodynamic properties for hydration of individual alkali metal and halide ions

Abstract Ionic radii based on electron-density distribution in crystalline sodium chloride and interionic distances in alkali halides of B1 structure have been used for estimation of the absolute standard enthalpies of hydration of individual alkali metal and halide ions at 298.15 K. The absolute standard partial molar entropies of hydration have also been assessed, and used in conjunction with the results for change in heat content to yield absolute standard Gibbs free energies of ionic hydration. Lattice enthalpies of alkali halides have been derived on the basis of more recent thermochemical data.