Bulletin of the Chemical Society of Japan · 1967 · 22 citations · 8 references
Natural SciencesChemistryAnalytical ChemistryOrganic ChemistryPhysical ChemistryAqueous Two-phase SystemsLiquid-liquid InterfacesPartition CoefficientSolution ChemistryAqueous Phase CompositionAqueous Phase PartitioningAqueous-phase ChemistryChemical Equilibrium ConstantsEquilibrium ConstantsLiquid-liquid Reaction SystemsSalting OutSalting-out Effects
Abstract The distribution of acetic, propionic and butyric acids, or of mixtures of two of these acids, between carbon tetrachloride and aqueous solutions has been studied at 25°C. The distribution data have been explained in terms of the partition of the acid monomer molecules and the dimerization of the monomer molecules in the organic phase. A salting-out effect has been observed upon additions of sodium perchlorate to the aqueous phase; this salting-out effect is larger in the order butyric>propionic>acetic acid. From the distribution data, the equilibrium constants for the distribution and the dimerization have been determined, and the formation constants for the mixed-dimer molecules have been compared with the statistical values. It has been concluded that the mixed-dimer molecules are equally stable or only a little less stable than had been statistically expected.
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