Densities (), viscosities () and speed of sound (U) of ternary liquid mixtures of primary alkanols such as 1-propanol, 1-butanol, 1-pentanol and 1-hexanol with the fixed binary solvent mixtures of N,N-dimethylacetamide (DMA) and acetophenone (ratio 4:2, respectively) were measured over the entire composition range at 303.15, 308.15 and 313.15 K and at atmospheric pressure. The observed experimental data have been utilized to evaluate some of the excess thermo dynamical parameters such as

more »

... ic compressibility (E), intermolecular free length (L f E), free volume (V f E), internal pressure (i E), Gibb's energy (¨G E), viscosity (E) and Grunberg's interaction parameter (d). The variation of these excess parameter with composition has been studied from the view point of intermolecular interactions in these mixtures. The excess properties are found to be either positive or negative depending upon the molecular interactions and the nature of the liquid mixtures.