RELATIONSHIP BETWEEN EXCESS MOLAR VOLUME AND REFRACTIVE-INDEX IN BINARY NONELECTROLYTE MIXTURES

It is possible to establish a relationship between the excess molar volume and refractive index in binary liquid mixtures. Correlations exist between the refractive index of a binary mixture and the refractive indices of the pure components. In this work, a comparison is made between the experimental values of excess molar volumes (for six binary mixtures) and the calculated values of refractive indices at one temperature. The analysis of the data shows that for the binary systems here studied, they cannot be described by a unique equation connecting both parameters, and that such an equation depends on the different kind of interactions between the components.