Molecular Interactions in Certain Binary Liquid Systems Involving Toluene at Temperature 313K

1 Department of Chemistry, Hislop College, Nagpur-440001, India. ________________________________________________________________________________________ Abstract: This paper presents experimental data for densities (ρ), viscosities (η) and ultrasonic speeds (U) of pure toluene (TOL), chlorobenzene (CB), bromobenzene (BB) and nitrobenzene (NB) and of their binary liquid mixtures at temperature 313 K. These parameters were used to determine the adiabatic compressibility (β), intermolecular free length (Lf), molar volume (Vm) and acoustic impendence (Z) and their excess values. The derived functions namely Vm E , Lf E , Z E and β E were used to have a better understanding of intermolecular interactions between the component molecules of the present liquid mixtures. The variations of these parameters with composition of mixture indicate the nature and extent of interaction between unlike molecules & suggest that the interactions occurring between toluene, chlorobenzene, bromobenzene and nitrobenzene molecules follow the sequence: Nitrobenzene> Chlorobenzene> Bromobenzene. The excess and deviation functions were fitted to Redlich-Kister type polynomial equation. The results provide information on the molecules in the pure liquids as well as in the binary mixtures.