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Issue 7, 1985

Thermodynamic functions for the transfer of 1-naphthoic acid from water to mixed aqueous solvents at 298 K

Abstract

Values of free energies, ΔGt, enthalpies, ΔHt, and entropies, ΔSt, of transfer of 1-naphthoic acid from water to water + ethanol, water + t-butyl alcohol and water + dimethyl sulphoxide (DMSO) mixtures at various mole fractions have been determined from solubility measurements at different temperatures. Variations of ΔGt with xcosolvent in the water-rich alcoholic mixtures are governed by the sign of the entropy term. For water + DMSO mixtures ΔGt is negative, but the variation of ΔHt with xDMSO shows different behaviour from that of water + alcohol mixtures. We have calculated molecular pair-interaction parameters (gxy, hxy and TSxy) in water for the three systems studied; hxy > 0 for water + alcohol mixtures and hxy < 0 for water + DMSO mixtures. The results are discussed in terms of solute–cosolvent and solute–water interactions.

Article information


J. Chem. Soc., Faraday Trans. 1, 1985,81, 1555-1561
Article type
Paper

Thermodynamic functions for the transfer of 1-naphthoic acid from water to mixed aqueous solvents at 298 K

M. C. Perez-Camino, E. Sanchez, M. Balon and A. Maestre, J. Chem. Soc., Faraday Trans. 1, 1985, 81, 1555 DOI: 10.1039/F19858101555

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