Densities and Molar Isobaric Thermal Expansions of the Water + Formamide Mixture over the Temperature Range from 274.15 to 333.15 K at Atmospheric Pressure

Abstract

The density of the {water (1) + formamide (2)} mixture has been measured over the whole composition range at temperatures from 274.15 to 333.15 K at atmospheric pressure using the vibration densimeter. The volumetric parameters of the mixture, such as the excess molar volume, molar isobaric thermal expansions, and apparent and partial molar volumes of water and formamide, as well as their limiting values, have been calculated. It was shown that the mixture formation resulted in the volume decrease at all temperatures, and the largest absolute value of the excess molar volume corresponded to the mixture composition of 2H2O-FA. The limiting partial molar volumes of water and formamide increased with the temperature rise. At a temperature of about 323 K the limiting partial molar volume of water became larger than its own molar volume.