This paper reports experimental densities and refractive indices of binary and ternary systems containing sulfolane, or dimethylsulfoxide, toluene and water over the whole composition range of mixtures at 303.15 K and atmospheric pressure. From these data, excess molar volumes, V E and molar refraction changes of mixing, δR were calculated. The obtained values of V E and ΔR for the binary mixtures were fitted to the Redlich -Kister equation and the binary parameters were used in the correlation

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... of the ternary results with Redlich -Kister and Cibulka polynomial equations. The significance of these results is discussed in terms of the structural changes in the mixtures.