Abstract
The electrical conductance of nicoitinium dichromate has been measured in water- N , N -dimethyl formamide mixtures of different compositions in the temperature range 283-313 K. The limiting molar conductance, L o and the association constant of the ion-pair, K A have been calculated using Shedlovsky equation. The effective ionic radii ( r i ) of (C 6 H 6 O 2 ) + and (C 6 H 6 O 2 NCr 2 O 7 ) - ions have been determined from L i 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.
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