Concentration dependence of the adiabatic compressibility of aqueous sodium chloride and its relation to the ionic hydration

The concentration dependence of the abiabatic compressibility of aqueous sodium chloride solutions has been determined in the concentration range from zero to the solubility limit at five temperatures: 10, 15, 20, 25 and 30˚C. A simple model, based on the hypothesis of existence of hydration spheres and their overlap with increasing salt concentration, is used to interpret the data