Abstract
Apparent molar volumes and viscosity B-coefficients for betaine hydrochloride in aqueous uracil solutions were determined from solution densities and viscosities measured at T=(298.15–318.15)K and at pressure p=101kPa as a function of betaine hydrochloride concentrations. The standard partial molar volumes ϕV0 and slopes SV∗ obtained from Masson equation were interpreted in terms of solute–solvent and solute–solute interactions, respectively. Solution viscosities were analyzed using Jones–Dole equation and the viscosity A and B coefficients discussed in terms of solute–solute and solute–solvent interactions, respectively. The standard volume of transfer ΔtϕV0 and viscosity B-coefficients of transfer (ΔtB) of betaine hydrochloride from water to aqueous uracil solutions were derived to understand various interactions in the ternary solutions. The activation parameters of viscous flow for the studied solutions were discussed in terms of transition state theory. The structure making or breaking ability of betaine hydrochloride was discussed in terms of the sign of dϕE0/dTP.
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