Author(s): Golamari Siva Reddy and Mallu Maheswara Reddy
The Ultrasonic velocity, Densities, viscosities, refractive index and Surface tension have been measured for binary mixture of Benzylparaben with Benzene at temperatures T=303.15, 308.15 and 313.15 K at different molefractions such as 0.1 to 1.0. The experimental data have been used to calculate the acoustical and thermodynamical parameters like excess molar volume (VE), viscosity deviation (Δη), refractive index deviation (ΔnD), deviations in ultrasonic velocity (Δu), isentropic compressibility (β), deviations in isentropic compressibility (Δβ), intermolecular free length (Lf), deviation in intermolecular free length (ΔLf), Acoustic impedance (Z), deviation in acoustic impedance (ΔZ), molar compressibility or Wada’s constant(W), molar sound velocity (R), degree of intermolecular attraction (δ), relaxation time (τ), Free volume (Vf) and absorption coefficient (α), deviation in surface tension (Δσ). The viscosity data have been correlated with the equations of Krishnan-Laddha and McAllister. The thermo physical properties under study were fit to the Jouyban-Acree model. The excess values were correlated using Redlich-Kister polynomial equation to obtain their coefficients and standard deviations. It was found that in all cases, the data obtained fitted with the values correlated by the corresponding models very well. The results are interpreted in terms of molecular interactions occurring in the solution.
