Molecular interaction studies in binary liquid mixtures containing ethyl acetate with n-octanol at different temperatures

Experimental values of ultrasonic velocity (u), density (ρ) and viscosity (𝜂) for the binary mixture Ethyl acetate (1) + n-Octanol (2) were measured over the whole composition range at temperature T = (295.15, 298.15,301.15 and 305.15) K and at the atmospheric pressure. From the experimental data excess sound velocity (u^E), excess viscosity (𝜂^𝐸), excess free volume (V_f^E ) and excess internal pressure (P_i^E) were calculated. These results have been fitted to the Redlich-Kister polynomial equation. Excess viscosity (𝜂^𝐸), excess free volume (V_f^E) and excess internal pressure (P_i^E) were found to be negative for all temperatures. Excess sound velocity (u^E), excess viscosity (𝜂^𝐸), excess free volume (V_f^E) and excess internal pressure (P_i^E) were plotted against the mole fraction of ethyl acetate over the whole composition range at 295.15, 298.15, 301.15 and 305.15 K. They have been analysed to discuss the nature and strength of intermolecular interactions in these mixtures.