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IJC-A Vol.48A(06) [June 2009] >


Title: Partial molar volumes of oxalic acid and its salts in water-rich binary aqueous mixtures of methanol
Authors: Parmar, M L
Guleria, M K
Keywords: Solution chemistry
Thermodynamics
Partial molar volumes
Ion-solvent interactions
Issue Date: Jun-2009
Publisher: CSIR
Abstract: Partial molar volumes of oxalic acid and its salts, viz., ammonium oxalate, sodium oxalate and potassium oxalate, have been determined in different compositions of water-rich binary aqueous mixtures of methanol (3, 6, 9, 12, and 15 wt. percent of methanol) from solution density measurements at 298.15 K and in 3% (w/w) methanol + water at different temperatures. The data have been analysed by using Masson equation and the obtained parameters have been interpreted in terms of ion-solvent and ion-ion interactions. The partial molar volumes vary with temperature as a power series of temperature. Structure making/breaking capacities of the electrolytes have been inferred from the sign of ([∂2φ0v / ∂T2)p, i.e. the second derivative of partial molar volume with respect to temperature at constant pressure. Oxalic acid and its salts act as structure breakers in binary aqueous mixtures of methanol.
Page(s): 806-811
ISSN: O975-0975 (Online); 0376-4710 (Print)
Source:IJC-A Vol.48A(06) [June 2009]

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