Effect of Dissolved Cadmium Chloride and Ammonium Chloride Salts on the Enthalpy of Mixing of the Methanol + Benzene System at 303.15 K

Abstract

The effect of two dissolved inorganic salts, cadmium chloride CdCl 2 and ammonium chloride NH 4Cl, on the excess enthalpy of mixing ( H E) of the binary system methanol + benzene measured at 303.15 K using an isothermal displacement calorimeter with vapor space is investigated in the present work. Compared to the salt-free system, a decreasing trend in the endothermicity of H E values is significant with the addition of CdCl 2 salt but the decrease in the H E values is insignificantly smaller with the addition of NH 4Cl salt. The experimental values of the enthalpy of mixing are fitted into a Redlich-Kister equation and the deviations in the values and the parameters are reported. The importance of the solute-solvent interactions and the solvent-solvent interactions are demonstrated from the increasing excess enthalpy of mixing values in the positive direction with the increase of salt concentration.