Prediction of excess volumes and excess surface tensions from experimentalrefractive indices

Refractive indices for the binary liquid mixtures: {hexane or heptane+ethan ol}, {o-xylene + benzene} and {cyclohexane + benzene, toluene or hexane} we re measured at 298.15 K. Excess refractive indices were calculated and fitt ed to a Redlich-Kister function. Using some mixture rules (Lorentz-Lorenz, Dale-Gladstone, Eykman, Oster, Arago-Blot and Newton), predictions for v(E) have been made and compared with experimental data taken from the literatu re. Furthermore the Sugden equation has been used in two different ways for predicting excess surface tensions: the first one starting from densities and the other one from refractive indices. Results are plotted together wit h the literature data.