Acoustic, Volumetric, and Viscometric Studies of Binary Mixtures of Tetrahydrofuran with n‑Butyl Acetate, Isobutyl Acetate, and tert-Butyl Acetate at 298.15, 303.15, and 308.15 K

The speed of sound (u), density (ρ), and viscosity (η) of binary mixtures including tetrahydrofuran (THF) and acetates, namely, butyl acetate (BA), tert-butyl acetate (TBA), and isobutyl acetate (IBA), were studied over the whole range of composition at temperatures of 298.15, 303.15, and 308.15 K. Thermodynamic parameters such as excess molar volume (V m E), excess molar isentropic compressibility (ΔK S,m E), viscosity deviation (Δη), excess Gibbs free energy of activation for viscous flow (ΔG*E), and partial molar volume (V̅ m,i ) have been calculated using the experimental data. The excess/deviation parameters were plotted against the mole fraction of THF. The measured negative and positive values of excess/deviation parameters were helpful for explaining the interactions in molecules of binary mixtures. The magnitude of these factors verifies the order of interaction of tetrahydrofuran with acetates. For the estimation of standard deviations and binary coefficients, excess and deviation parameters were correlated using a Redlich–Kister type polynomial equation. Further, to assess the correlation ability of various models for viscosity, standard deviations were also determined.