INTERNAL PRESSURE , FREEVOLUME AND ADIABATIC COMPRESSIBILITY ANALYSIS OF AMIDES IN NON - AQUEO U S MEDIUM Padmavathy . R 1 , Santha K uma ri. S 2 , Jasmine Vasantha Rani . E

Measurement of ultrasonic velocity in non - aqueous solutions gives information about the behavior of solution such as molecular association and disassociation. The attraction and repulsion between the molecules of the components involved show considerab le effect upon the physical and chemical prop erties of a solution such as density, viscosity and ultrasonic velocity. Sulphanilamide is the parent compound of all the sulfa - drugs which is important in urinary tract infections and meningococcal meningitis profilaxes. Benzenesulphonamide is one of the sulfa drug used in the treatment of gastrointestinal, duodenyl ulcer, neurological disorder are analyzed for the solution of the sample, in formamide. The passage of ultrasonic waves through solutions and liquids disturb the equilibrium between solute a nd solvent molecules. In the present work, non - aqueous solutions of both have been prepared with different concentrations and the experiments were carried out from a low temperature of 5 c to a high temperature of 55 c.The various interactions occurring in the solutions are interpreted in terms of ion - ion and ion - solvent interactions. Internal pressure, free volume is the thermo dynamical parameters to explain about the wealth of information about the state of liquids. The free volume is generalized aspect of the idea that each molecule is enclosed by its neighbors in a cell. . The structural change of molecules in the solution takes place due to the existence of electrostatic field between the interacting molecules. The arrangement of the molecules results in the effect of adiabatic compressibility. The analysis of the study reveals the structural changes occurring in the solution. Key Words: Amides, Internal Pressure, Free V olume , Adiabatic Compressibility, Ion - Solvent Interactions