The ultrasonic velocity and density of binary liquid mixtures of quinoline with o-xylene, m-xylene, and p-xylene have been measured over the entire range of composition at = 303.15, 308.15, 313.15, and 318.15？K. Using these data, various parameters like adiabatic compressibility (β), intermolecular free length ( ), and acoustic impedance ( ) and some excess parameters like excess adiabatic compressibility ( ), excess intermolecular free length ( ), excess acoustic impedance ( ), and excess ultrasonic velocity ( ) have been calculated for all the three mixtures. The calculated deviations and excess functions have been fitted to Redlich-Kister polynomial equation. The observed deviations have been explained on the basis of the intermolecular interactions present in these mixtures. 1. Introduction In studying the molecular interactions and physicochemical behaviour of binary liquid mixtures [1, 2], the knowledge of thermodynamic and acoustical properties is of great importance. The results are frequently used in process design in many chemical and industrial processes. The studies of binary mixtures containing aromatic hydrocarbons are interesting because they find applications in preferential interactions of polymers in mixed solvents and the studies of polymer phase diagrams. Quinoline is widely used in the manufacturing of dyes, pesticides, and solvent for resins and terpenes. Xylenes are used in printing, rubber, and leather industries. Basically, a binary liquid mixture is formed by the replacement of like contacts in pure liquids by unlike contacts in the mixture. The quantitative and qualitative analyses of excess functions provide information about the nature of molecular interactions in the binary mixtures [3–5]. The literature survey reveals that there has been practically no study of the binary mixtures of these systems from the point of view of their ultrasonic behaviour. In an attempt to explain the nature of interactions occurring between quinoline and xylenes, ultrasonic velocity and density of binary liquid mixtures of quinoline + o-xylene/m-xylene/p-xylene have been determined over the entire range of composition at = 303.15, 308.15, 313.15, and 318.15？K. Using the experimental values of and , adiabatic compressibility ( ), intermolecular free length ( ), and acoustic impedance ( ) and some excess parameters like excess adiabatic compressibility ( ), excess intermolecular free length ( ), excess acoustic impedance ( ), and excess ultrasonic velocity ( ) have been calculated. The results were fitted to the Redlich-Kister polynomial
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