Acoustic and volumetric studies of uracil in aqueous urea solution at different temperatures

Volumetric, viscometric and ultrasonic studies of uracil in an aqueous urea solution in varying concentration of 2, 3 and 5 M have been carried out at 298, 308 and 318 K. The uracil concentration in the aqueous urea solution varies from 0.05% to 0.4%. Density (rho), viscosity (eta) and sound speed (u) have been measured. The experimental data are used for computing various thermodynamic and acoustic parameters, namely apparent molar volume, isentropic compressibility, apparent isentropic compressibility, relative association, intermolecular free length, acoustic impedance, viscous relaxation time, hydration number, Gibb's free energy, classical absorption coefficient of the solution and viscosity data have been further analysed in the light of Masson's equation and Jones-Dole's equations, respectively. The results have been discussed in terms of solute-solute and solute-solvent interaction and the structural changes of the solutes in solutions. The effect of variation of temperature on these interactions has also been investigated.