A. Sarkar, Dipu Kumar Mishra, B. Sinha
Mar 9, 2016
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0
Influential Citations
9
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Journal
Journal of Solution Chemistry
Abstract
The densities and viscosities of l-ascorbic acid (vitamin C) in aqueous tetrabutylammonium hydrogen sulfate (Bu4NHSO4) solutions at several different concentrations of Bu4NHSO4 ($$ m_{{{\text{Bu}}_{4} {\text{NHSO}}_{4} }} $$mBu4NHSO4 = 0.000, 0.005, 0.010, 0.015 and 0.020 mol·kg−1) were determined at T = (298.15–318.15) K under atmospheric pressure. Using these experimental data, values of the apparent molar volume ($$ \phi_{V} $$ϕV), standard partial molar volume ($$ \phi_{V}^{ 0} $$ϕV0), the slope ($$ S_{V}^{ *} $$SV∗), standard isobaric partial molar expansibility ($$ \phi_{E}^{ 0} $$ϕE0) and its temperature derivative $$ ({{\partial \phi_{E}^{ 0} } \mathord{\left/ {\vphantom {{\partial \phi_{E}^{ 0} } {\partial T}}} \right. \kern-0pt} {\partial T}})_{p} $$(∂ϕE0∂T)p, the viscosity B-coefficient and solvation number ($$ S_{\text{n}} $$Sn), etc., were determined. Viscosity B-coefficients were further utilized to obtain the Gibbs energies of activation of viscous flow per mole of the solvents ($$ \Delta \mu_{ 1}^{ 0\ne } $$Δμ10≠) and of the solute ($$ \Delta \mu_{ 2}^{ 0\ne } $$Δμ20≠). The effects of molality, solute structure and temperature on all these parameters were analyzed in term of ion–ion and ion–solvent interactions, which revealed that the solutions are characterized predominantly by ion–solvent interactions and l-ascorbic acid behaves as a long-range structure maker.