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Viscosity (η), Density (ρ) and Ultrasonic velocities (U) are reported for binary mixtures of Formamide (FA), NMethylformamide (MFA) and N, N-Dimethylformamide (DMF) in an aqueous medium over an entire range of compositions at 298.15K and atmospheric pressure. From the experimental data obtained, viscosity deviation (∆η), deviation in isentropic compressibility (∆Ks) and excess properties like excess molar volume (V), excess intermolecular free length (Lf), excess available volume (Va) and excess internal pressure (πi) have been calculated and are fitted to Redlich-Kister type polynomial equation. The results obtained are interpreted in terms of molecular interactions among the studied amide solutions. The deviation from ideal mixing law in all calculated parameters are negative except deviation in viscosity and deviation in excess internal pressure for Nmethylformamide and N,N-dimethylformamide-Water mixtures. This reveals the nature and magnitude of intermolecular interactions between unlike molecules and effect of –CH3 in amides. Substitution of -H by -CH3 at the N site caused a noticeable effect on the excess parameters.

VISCOSITY, DENSITY AND ULTRASONIC VELOCITY STUDIES OF BINARY AQUEOUS SOLUTIONS CONTAINING AMIDES