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.