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Electrochemical Studies on the Interaction of Cadmium Ion with Kryptofix 22 in MeOH-DMF Solutions at different Temperatures

2012; Volume: 2; Issue: 4 Linguagem: Inglês

10.5923/j.scit.20120204.03

2163-2677

Esam A. Gomaa, B. A. M. Al-Jahdali,

Chemical and Physical Properties in Aqueous Solutions

The interaction between Cd 2+ ion and Kryptofix 22 in pure MeOH and DMF solvents and their binary mixtures (0-100 % MeOH-DMF) at different temperatures (298.15-313.15) were measured by conductometric titrations. The conductance data in all cases were analysed using the Fuoss - Shedlovsky and Fuoss-Kraus methods to get the limiting molar conductance (Λ 0  and the association constant (K A ) simultaneously. Accordingly, the computer program of Fuoss equation has been used. The conductance studies indicate the formation of 1:1 complex between the Cd 2+ ion and Kryptofix 22. From the conductivity data obtained, the values of the Walden products (Λ o η o ) were also calculated. Based on the composition dependence of Walden products, the influence of the solvent composition on the solvation of the ion has been discussed. Thermodynamic parameters as well as refractive indices have been determined for Cd 2+ ion in the mixed solvents at different temperatures with respect to solute-solvent interaction. This work gives a lot of data for cadmium ions which help in analysis.