Study of acoustical parameters in the binary liquid mixtures containing n-alkanes

From the measured value of speed of sound (u), density () for binary liquid mixtures of n-heptane+ n-hexane, n-hexane+ toluene, n-heptane+ toluene at 298.15K, we calculate some acoustical parameters like inter molecular free length (Lf), acoustic impedance (Z), relative association (RA).The excess intermolecular free length ( ) and excess acoustic impedance (Z E ) have also been calculated.The excess values are used to understand the molecular interaction between the components of binary mixtures.The deviation in intermolecular free length and acoustic impedance is negative throughout the composition in all three binary mixtures.The theoretical values of ultrasonic speed were calculated using different formulations.