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Preferential Solvation of Acetic Acid in Binary Mixtures of Carbon Tetrachloride–Cyclohexane and Carbon Tetrachloride–1,2-Dichloroethane

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Abstract

The partition of acetic acid between aqueous solutions and various binary mixtures of carbon tetrachloride + cyclohexane and carbon tetrachloride + 1,2-dichloroethane were carried out at 30.0 °C. The nonlinear dependence of both the monomer partition coefficient and the dimerization constant on the mole fraction composition has been rationalized in terms of preferential solvation of the various solvation sites of the involved species. Two and four polar sites were identified for the monomer and dimer forms, respectively. The solvation preference is controlled by the relative polarities of the binary solvent components, being, in general, higher for the monomer sites compared to the dimer ones. The dimer is almost equally stable in various carbon tetrachloride + 1,2-dichloroethane mixtures, and the variation of dimerization constants with changing binary composition arises mainly from the monomer solvation stabilization.

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Abbreviations

C :

overall molar concentration of acetic acid in all of its possible forms

D :

partition coefficient on the molar scale

K d :

partition coefficient for acid monomer transfer

K dim :

dimerization constant of a carboxylic acid

φ i :

preferential solvation ratio for the i th site

n :

mole fraction of 1,2-dichloroethane in carbon tetrachloride + 1,2-dichloroethane binary mixtures or mole fraction of carbon tetrachloride in carbon tetrachloride + cyclohexane binary mixtures

aq:

aqueous phase

o:

organic phase

H:

hydrogen bonding site

P:

polar site

M :

acetic acid monomer

D :

acetic acid dimer

cyc:

cyclohexane

dic:

1,2-dichloroethane

ccl:

carbon tetrachloride

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Authors and Affiliations

  1. College of Technological Studies, Public Authority for Applied Education and Training, Kuwait, Kuwait

    M. F. Hegazi & H. F. Al-Mudhaf

  2. P.O. Box 43886, Hawalli, 32053, Kuwait

    A. I. Abu-Shady

Authors
  1. M. F. Hegazi
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  2. H. F. Al-Mudhaf
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  3. A. I. Abu-Shady
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Correspondence to A. I. Abu-Shady.

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Hegazi, M.F., Al-Mudhaf, H.F. & Abu-Shady, A.I. Preferential Solvation of Acetic Acid in Binary Mixtures of Carbon Tetrachloride–Cyclohexane and Carbon Tetrachloride–1,2-Dichloroethane. J Solution Chem 36, 467–478 (2007). https://doi.org/10.1007/s10953-007-9127-4

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  • DOI: https://doi.org/10.1007/s10953-007-9127-4

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