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Partial molar volumes; citric acid; tartaric acid; water + ethanol mixture; structure breaker

Partial molar volumes of citric acid and tartaric acid have been determined in water and binary aqueous mixtures of ethanol (5, 10, 15, 20 and 25% by weight of ethanol) at different temperatures and acid concentrations from the solution density measurements. The data have been evaluated by using Masson equation and the obtained parameters have been interpreted in terms of solute-solvent interactions. The partial molar volumes vary with temperature as a power series of temperature. Structure making/breaking capacities of the organic acids have been inferred from the sign of$$[\partial ^2 \phi _V^0 /\partial T^2 ]_{p,} $$ i.e. second derivative of partial molar volume with respect to temperature at constant pressure. Both the organic acids behave as structure breakers in water and water + ethanol.

M L Parmar¹ R K Awasthi¹ M K Guleria¹

1. Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla - 171005, India

Published

January 2004

Manuscript received

19 March 2003

Manuscript revised

17 June 2003