Standard Partial Molar Heat Capacity and the Volume of the Cadmium Ion in Acetonitrile at 298.15 K

Abstract

The heat capacity and volumetric properties of cadmium iodide solutions in acetonitrile (AN) are measured at 298.15 K by calorimetric and densimetric means. Standard partial molar heat capacity \(\bar {C}_{{p,2}}^{^\circ }\) and volume \(\bar {V}_{2}^{^\circ }\) of CdI₂ in AN are calculated. Standard heat capacity \(\bar {C}_{{p,i}}^{^\circ }\) and volume \(\bar {V}_{i}^{^\circ }\) of the cadmium ion in AN at 298.15 K are determined. The effect produced by the nature of such solvents as AN, DMF, DMSO, and MP on \(\bar {C}_{{p,i}}^{^\circ }\) and \(\bar {V}_{2}^{^\circ }\) of the cadmium ion is analyzed, and a substantial contribution from the electrostatic component is discovered.