Abstract

Ion-solvation behaviour of Nicotinium dichromate in water-N,N-dimethyl formamide mixtures at 293K

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


Author(s): Veerati Radhika

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