Volumetric and Viscometric Investigations of Binary Mixtures of Ethyl Acetate with Isobutanol and n-Hexane at Different Temperatures

Densities and viscosities of binary liquid mixtures of ethyl acetate with isobutanol and n-hexane were measured over the entire range of composition at 303.15, 308.15, 313.15 and 318.15 K. The experimental density and viscosity data have been used to evaluate the excess molar volume , excess viscosity, (ηE), excess Gibb’s free energy of activation for viscous flow () and Grunberg-Nissan interaction parameter (d12). The calculated values of excess functions, , ηE and were fitted to the Redlich-Kister polynomial equation to obtain fitting coefficient (Ai) and standard deviation (). The observed values of excess parameters for both the liquid mixtures have been interpreted in terms of molecular interactions in the mixtures. The observed excess molar volumes,are positive and excess viscosity, ηE have been found to be negative over the whole composition range at all investigated temperatures for both the systems. In addition, the values of and d12 are negative for both the binary mixtures. These findings indicate that chemical or specific interactions between the unlike component molecules are absent for both the mixtures and dispersion type of forces are predominant.