Abstract

Density and viscosity, ultrasonic study for the binary mixtures of n-butanol and N-N-dimethyl acetamide over the
entire concentration range were measured at temperatures 303.15 K. The experimental data then used to calculate
the compressibility and acoustic impedance, molecular free length, inverse relaxation time, and excess parameters.
The values of excess properties further fitted with Redlich–Kister polynomial equation to estimate the binary coefficients.
The resulting excess functions were interpreted in terms of the interactions between the molecules in the binary mixtures.