Volumetric and viscometric behaviour of pyridoxine hydrochloride in aqueous tetrabutylammonium hydrogen sulphate solutions at different temperatures

• Densities and viscosities of pyridoxine hydrochloride in aqueous TBAHS solutions measured.
• Apparent molar volume (ϕVϕV) and standard molar volume (ϕV0) determined.
• Viscosity B-coefficient was determined.
• Effect of molality, solute structure and temperature analyzed in terms of ion-ion and ion-solvent interactions.
• Pyridoxine hydrochloride behaves as a long range structure maker.

Apparent molar volumes and viscosity B-coefficients for pyridoxine hydrochloride in aqueous tetrabutylammonium hydrogen sulphate (TBAHS) solutions were determined from solution density and viscosity measurements at T = (288.15–318.15) K and p = 101 kPa as a function of pyridoxine hydrochloride concentration. The standard partial molar volume and slopes, obtained from the Redlich-Meyer equation, have been interpreted in terms of solute-solvent and solute-solute interactions respectively. The viscosity data were analyzed using the Jones-Dole equation and the derived parameters A and B were interpreted in terms of solute-solute and solute-solvent interactions respectively. The standard volume of transfer and viscosity B-coefficients of transfer of pyridoxine hydrochloride from water to aqueous TBAHS solutions were derived to study various interactions in the ternary solutions. The activation parameters of viscous flow for the ternary solutions were also calculated and explained in terms of transition state theory.

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