Volume properties of liquid mixture of {water (1) + ethylenediamine (2)} over the temperature range from 274.15 to 333.15 K at atmospheric pressure

Abstract

The density of {water (1)+ethylenediamine (2)} binary mixture was measured over the whole concentration range at temperatures from 274.15 to 333.15K and at atmospheric pressure. The experimental values were used to calculate a whole number of the mixture parameters such as the excess molar volumes, molar isobaric expansions, apparent and partial molar volumes, partial molar isobaric expansions, limiting partial molar volumes and limiting partial molar isobaric expansions both of water and ethylenediamine. The extremal dependence of the partial molar volumes of the mixture components was observed; the mixture excess molar volumes were negative at all temperatures and depended weakly on temperature. The concentration dependences of the partial molar volumes of the mixture components were very similar to the dependences for aqueous mixtures of the nonelectrolytes with hydrophobic properties. The mixture molar isobaric expansion increased with ethylenediamine concentration over the whole concentration range. The concentration dependences of partial molar isobaric expansions of both water and ethylenediamine were rather complex and correlated with the mixture melting diagram.