THERMODYNAMICS OF SOLVATION OF IONS .6. THE STANDARD PARTIAL MOLAR VOLUMES OF AQUEOUS IONS AT 298 15-K

The standard partial molar volumes at 298.15 K of 138 aqueous ions ranging in their charges from -4 to +4 have been compiled. They are described by essentially the same model that was used previously to describe thermodynamic functions of ion hydration. This model involves a hydration shell of specified thickness, where most of the electrostriction takes place, so that the volume of the ion is the difference between that of the hydrated ion and the electrostriction caused by the charge. Hydrophobic ions have an extra structural contribution to their volume.