Abstract
The densities and viscosities of thiamine hydrochloride (vitamin-B1) in aqueous tetrabutylammonium hydrogen sulphate (Bu4NHSO4) solutions with several molal concentrations (mBu4NHSO4=0.000, 0.005, 0.010, 0.015 and 0.020mol⋅kg‐1) of Bu4NHSO4 were determined at T=(298.15, 308.15 and 318.15) K under atmospheric pressure. Using experimental data apparent molar volume (φV), standard partial molar volume (φV0), the slope (SV), standard isobaric partial molar expansibility (φE0) and its temperature dependence(∂φE0/∂T)P, the viscosity B-coefficient and solvation number (Sn), etc., were determined. Viscosity B-coefficients were further utilized to obtain the free energies of activation of viscous flow per mole of the solvents (Δμ10≠) and of the solute (Δμ20≠). Effects of molality, solute structure and temperature on all these parameters were analyzed in term of ion-ion and ion-solvent interactions; results revealed that the solutions are characterized predominantly by ion-solvent interactions and thiamine hydrochloride behaves as a long-range structure maker.
Published Version
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