Thermodynamic Interactions in Binary Mixtures of Dimethyl Sulphoxide with Amines From the Excess Properties of Ultrasonic Velocity, Viscosity and Density

Experimental values of density, viscosity and ultrasonic velocity are presented for the binary mixtures of dimethyl sulphoxide (DMSO) with methyl amine (CH 3 NH 2 ), dimethyl amine ((CH 3 ) 2 NH) and trimethyl amine ((CH 3 ) 3 N) at 303.15 K over the entire mole fraction of the mixture components. From these data, excess isentropic compressibility (β E S ), excess intermolecular free-length (L E f ), excess acoustic impedance (Z E ), excess viscosity (η E ) and excess volume (V E ) have been calculated. These quantities are further fitted to the Redlich-Kister relation to estimate the binary interaction parameters and standard errors. The results are analysed in terms of nature and degree of interaction between the component molecules. The nature of variation of these excess parameters provides information about the type of interaction taking place in these binary systems.