Thermochemical investigations of associated solutions. 10. Excess enthalpies and excess volumes of ternary acetone + bromoform + n-hexane mixtures

Abstract

Excess molar volumes and excess enthalpies are reported for binary acetone + n-hexane, bromoform + n-hexane and acetone + bromoform mixtures, and for the ternary acetone + bromofonn + n-hexane system at 308.15 K.. Results of these measurements are used to test the applications and limitations of a newly derived conventional non-electrolyte associated solution model. The general model assumes that the Gibbs free energy, excess volume and excess enthalpy can be separated into a chemical and physical contribution. The chemical interaction term results from the formation of molecular complexes and the physical contribution describes non-specific interactions between the uncomplexed and associated species in solution. Six binary interaction parameters are initially needed to describe all the binary non-specific interactions present. Simplifying approximations and mathematical manipulations reduces the number of binary interaction parameters to only three values.