Thermodynamic properties of transition metals in aqueous solution: 3. The heats of mixing aqueous solutions of CdCl2, NiCl2 and ZnCl2 with NaCl at varying ionic strength at 25°C

Abstract

Many fields, including oil recovery, require aqueous electrolyte data under relevant conditions. The heat of dilution of aqueous solutions of ZnCl[sub 2] and the heats of mixing [Delta]H[sub m] of aqueous solutions of CdCl[sub 2], NiCl[sub 2], and ZnCl[sub 2] with NaCl solutions were measured at 25[degrees]C. The heats of mixing were made at constant ionic strengths of 0.5, 1.0, and 3.0 molal. The excess enthalpy equations of Pitzer were then fitted to the resulting heats of dilution and heats of mixing data. The resulting parameters are the temperature derivatives of the activity coefficient mixing parameters in the Pitzer system. 38 refs., 5 tabs.