Limiting apparent molar volumes and their temperature derivatives for ammonium sulfate, potassium sulfate and aluminium sulfate in aqueous dimethylformamide

Densities of ammonium sulfate, potassium sulfate and aluminium sulfate have been measured in dimethylformamide (DMF) + water, containing 5, 10, 15 and 20 mass% of DMF, at different concentrations and at 298.15, 303.15, 308.15 and 313.15 K. From these data apparent molar volumes have been derived and analyzed using Masson equation. The limiting apparent molar volume (V) and slope (5v) are interpreted in terms of solute-solvent and solute-solute interactions, respectively. The values vary with temperature as a power series of temperature. The structure-making/breaking capacities of salts have been inferred from the Heplerʹs criterion.