Research Article
Veerati Radhika
Abstract
Molar conductivities of dilute solutions of Nicotinium dichromate, (c < 0.0021 eq·dm−3) were measured in binary aqueous mixtures containing up to 100 % cosolvent (N, N- dimethyl formamide) at 293 K ± 0.1. Data were treated by the Shedlovsky equation, and its parameters, the limiting equivalent conductivity, Λ0, and the association constants, KA, were evaluated. Variations in Walden products and KA were interpreted in terms of ionic properties as well as solvent structure and dielectric constant. The distances of closest approach which were determined were compared with those found using the Kraus-Bray equation. The effective ionic radii (ri) of Nicotinium dichromate have been determined from Li o values using Gill’s modification of the Stokes law. The influence of the mixed solvent composition on the solvation of ions has been discussed with the help of ‘R’-factor. Thermodynamic parameters are evaluated and reported. The results of the study have been interpreted in terms of ion-solvent interactions and solvent properties