Excess molar volumes of ternary liquid mixtures composed of 1, 4-dioxane, o-toluidine, and aromatic hydrocarbon at temperature of 308.15Â K

Excess molar volumes, VijkE, of 1,4-dioxane (i) + o-toluidine (j) + benzene or toluene or m- or p-xylene (k) ternary mixtures have been measured dilatometrically as a function of composition at 308.15 K. The resulting VijkE data have been fitted to Redlich-Kister equation to evaluate ternary adjustable parameters and standard deviations σ(VijkE). The observed VijkE data have been analyzed in terms of (i) Graph theory; and (ii) Prigogine-Flory-Patterson theory. It has been observed that Graph theory correctly predicts the sign and magnitude of VijkE values.