Partial Molar Volumes of Hexaamminecobalt(III) Nitrate in Proteated and Deuterated Water

The partial molar volumes (V 2) for hexaamminecobalt(III) nitrate in proteated and deuterated water were determined at 0.00 (for H2O only), 5.00, 10.00, 15.00, and 20.00 °C. The increase of the solute’s partial molar volume with increasing concentration and the negative second derivative of the solute’s partial molar volume at infinite dilution with respect to temperature were interpreted in terms of the solvent structure breaking property of the solute. In addition, the difference at each temperature between the solute’s partial molar volume at infinite dilution for proteated and deuterated water was used to estimate the solvent coordination number at each temperature.