Ultrasonic velocity, density, viscosity and refractive index measurements of caffeine in 0.1M, 0.05M and 0.025M aqueous solutions of sodium chloride, potassium chloride, calcium chloride and magnesium chloride have been carried out at 303.15K. From these experimental data isentropic compressibility, acoustic impendence, relative association, free length, apparent molar volume, apparent molar isentropic compressibility and molar refraction of caffeine at infinite dilution in presence of electrolytes are evaluated. These values have been employed to explain molecular association and solute-solvent interaction through hydrogen bonding and solvation. Viscosity data have been analyzed in the light of Jones-Dole equation and the constants A and B have been estimated and interpreted in terms of ion-ion and ion-solvent interactions occurring in solutions.\r\nKeywords: ultrasonic velocity, density, viscosity, refractive index, solute-solvent, solute-solute interaction.
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