Apparent molar volumes Vφand apparent molar heat capacitiesCp, φ were determined for aqueous solutions of magnesium chloride (MgCl2) and cadmium chloride (CdCl2) at molalities m = (0.01 to 1.0)mol · kg − 1, at T = 278.15 K to T = 393.15 K, and at the pressure 0.35 MPa. Apparent molar volumes were calculated from densities obtained using a vibrating-tube densimeter. Apparent molar heat capacities were obtained using a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter. These results were used to create the surfaces (Vφ, m, T) and (Cp, φ,m , T) which were fitted by regression. Differences in ion–ion interactions for MgCl2(aq) and CdCl2(aq) are observed by comparison of the regression surfaces.