Evaluation of limiting molar conductance, Walden product, association constant and thermodynamic properties of Sulfacetamide sodium (cas 127-56-0) in water + EtOH mixtures

Add time:09/10/2019    Source:sciencedirect.com

The ion solvation behavior of Sulfacetamide sodium (cas 127-56-0) in water and various volume fractions of ethanol (EtOH) in water in the range of 283 to 313 K, using electrical conductivity principle have been studied. The conductance data were analyzed according to Kraus–Bray and Shedlovsky models of conductivity. The limiting molar conductance λmo, association constant Ka, energy of activation of the rate process (Ea), and related thermodynamic parameters have been determined. Using viscosity of the solvent, Walden product (λmoη0) and Stokes molecular radius have been determined. Standard thermodynamic parameters of association (ΔGa, ΔHa,) were calculated and discussed. The limiting molar conductance sharply decreased for the increased amount of ethanol suggesting the increased ion–solvent and solvent–solvent interactions.

► Ion solvation behavior of Sulfacetamide sodium in water and water-ethanol mixtures. ► Kraus-Bray and Shedlovsky models of Conductivity. ► The limiting molar conductance decreases with increase in the amount of ethanol. ► Maxima in the Walden product near 0.3 volume fraction of ethanol in water.

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