Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (09): 838-844.doi: 10.3866/PKU.WHXB19990913

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Enthalpies and Entropies of Dissolution and Dissociation of Benzoic Acid in EtOH-H2O and i-PrOH-H2O Mixtures

Hu Xin-Gen, Lin Rui-Sen, Zong Han-Xing   

  1. Department of Chemistry,Zhejiang University,Hangzhou 310027
  • Received:1998-11-30 Revised:1999-02-09 Published:1999-09-15
  • Contact: Lin Rui-Sen

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Abstract:

In this paper, the dissolution and dissociation enthalpies of benzoic acid in ethanol water and isopropanol-H2O mixtures have been determined by two kinds of microcalorimeters respectively. Combined with the corresponding Gibbs function changes existing in the literature, the dissolution and dissociation entropies have been calculated. Great efforts have been made to interpret the characteristic variations of the transfer enthalpies and entropies according to the skin phase model for solute solvent interactions and the structure alteration of the mixed solvents.

Key words: Benzoic acid, Mixed solvent, Dissolution enthalpy, Dissociation enthalpy, Skin phase model