Salt effect on the enthalpy of mixing of water+methanol at 303.15 K

The excess enthalpy of the miscible water–methanol system has been measured at 303.15 K in an isothermal batch calorimeter with vapour space. The effect of the salts NH₄Cl, CdCl₂ and HgCl₂ on H^E was studied. A decreasing trend in excess enthalpy for NH₄Cl and HgCl₂ but an increasing trend for CdCl₂ with increasing salt concentrations have been observed. The experimental values of H^E have been correlated using a modified Redlich–Kister equation and the binary parameters have been estimated. The deviations were calculated and reported.