EFFECT OF DIELECTRIC CONSTANT ON THE SOLVATION OF SODIUM CITRATE

  • J ISHWARA BHAT Department of Chemistry, Mangalore University, Mangalagangothri-574199
  • M N MANJUNATHA S.J.C. Institute of Technology, Chickballapur-562101, India.

Abstract

The paper reports on the solvation of Sodium citrate in water, water + CH3 0 λ m CN and water + DMSO mixtures (v/v) under varying dielectric constant at different temperature. The specific conductance data obtained was analyzed by Kraus-Bray and Shedlovsky conductivity models. Limiting molar conductance ( ), dissociation constant/ association constant (KC/Ka 0 λ m ) were evaluated for all the solvent compositions. The limiting molar conductance, decreases with the increase in amount of co-solvent in water, due to increased solvent-solvent interaction and decrease in dielectric constant. Due to high viscosity and molecular size of DMSO in water, lower conductance was observed in water + DMSO media. The Ka values increases with the increase in amount co-solvent in water at all the temperatures studied. Energy of activation of the rate process and related thermodynamic parameters such as ΔHa, ΔGa and ΔSa have been evaluated. ΔGa is found to be negative indicating spontaneity of the process. Walden product (λ0mη0) and corrected Stoke’s radius (r ) have also been evaluated. Fuoss- Accascina equation was used to identify the ion-pairs and ion-triplets in the system. But the slopes of the plot were found to be less than -0.5, indicating the absence of ion-pairs or ion-triplets. Born relation of solvation was verified. These data have been used to study the nature of ion-solvent interaction and solvent-solvent interactions existing in the system

Keywords: Dielectric constant, Solvation, Limiting molar conductance, Sodium citrate.

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How to Cite
BHAT, J. I., and M. N. MANJUNATHA. “EFFECT OF DIELECTRIC CONSTANT ON THE SOLVATION OF SODIUM CITRATE”. International Journal of Chemistry Research, Vol. 3, no. 2, Jan. 2012, pp. 6-14, https://ijcr.info/index.php/journal/article/view/84.
Section
Research Article