EXCESS AND APPARENT MOLAR VOLUMES OF MIXTURES OF WATER AND ACETONITRILE BETWEEN 0-DEGREES-C AND 25-DEGREES-C

From densities measured at 0, 1, 2.5, 5, 10 and 25-degrees-C of mixtures of water and acetonitrile, the excess molar volumes and the apparent and partial molar volumes of both components have been derived as a function of mixture composition. Contrary to results on enthalpies of solution in mixtures of water and acetonitrile, the values obtained do not show substantial changes around 0.7 mole fraction of water. At this composition and at low temperatures, the excess molar volumes exhibit a rather flat minimum and the apparent and partial molar volumes of water show an inflection.