Journal of Solution Chemistry

, Volume 24, Issue 1, pp 89–102

Excess partial molar enthalpies, entropies, Gibbs energies, and volumes in aqueous dimethylsulfoxide

  • John T. W. Lai
  • Frankie W. Lau
  • Damon Robb
  • Peter Westh
  • Gerda Nielsen
  • Christa Trandum
  • Aase Hvidt
  • Yoshikata Koga
Article
  • 244 Downloads

Abstract

The excess partial molar enthalpies, the vapor pressures, and the densities of dimethylsulfoxide (DMSO)−H2O mixtures were measured and the excess partial molar Gibbs energies and the partial molar volumes were calculated for DMSO and for H2O. The values of the excess partial molar Gibbs energies for both DMSO and H2O are negative over the entire composition range. The results for the water-rich region indicated that the presence of DMSO enhances the hydrogen bond network of H2O. Unlike monohydric alcohols, however, the solute-solute interaction is repulsive in terms of the Gibbs energy. This was a result of the fact that the repulsion among solutes in terms of enthalpy surpassed the attraction in terms of entropy. The data in the DMSO-rich region suggest that DMSO molecules form clusters which protect H2O molecules from exposure to the nonpolar alkyl groups of DMSO.

Key Words

Aqueous dimethylsulfoxide excess partial molar enthalpies entropies Gibbs energies and volumes solute-solute interaction 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • John T. W. Lai
    • 1
  • Frankie W. Lau
    • 1
  • Damon Robb
    • 1
  • Peter Westh
    • 2
  • Gerda Nielsen
    • 2
  • Christa Trandum
    • 2
  • Aase Hvidt
    • 2
  • Yoshikata Koga
    • 3
  1. 1.Department of ChemistryThe University of British ColumbiaVancouverCanada
  2. 2.Carlsberg Foundation Fellow, Department of ChemistryUniversity of CopenhagenCopenhagenDenmark
  3. 3.Center for Ceramics Research, Research Laboratory of Engineering MaterialsTokyo Institute TechnologyYokohamaJapan

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