THERMODYNAMIC INTERACTIONS IN MIXTURES OF BROMOFORM WITH HYDROCARBONS

Thermodynamic interactions in binary mixtures of bromoform with hydrocarbons have been studied in terms of a number of excess functions from the measured mixture properties such as density, viscosity, sound velocity, refractive index, and dielectric constant. Results of excess molar volume, apparent excess molar viscosity, and excess molar Gibbs free energy of activation of flow have been discussed in terms of destruction or creation of order and/or induced conformational changes in liquid n-alkanes in the presence of a nearly spherical bromoform molecule. These facts have been confirmed from a further discussion of thermodynamic interactions from the calculated excess isothermal and isobaric compressibilities. Among the refractive index mixture rules, the Eykman relation appears to give satisfactory results. The dielectric and internal pressure properties of the mixtures seem to provide additional information toward the understanding of thermodynamic interactions in these mixtures. The calculation of polarizability of the mixtures further support 1:1 weak molecular complexes formed in these mixtures.