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No. of pages: 54

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Abstract:

The effects of temperature, dielectric constant and catalysis in the kinetics of the oxidation–reduction reactions (involving electron transfer) of N-(2-hydroxy-ethyl) ethylenediammine- N’,N’,N’-Triacetatocobalt (II) by Cu2+ cation were determined. The dielectric constant was decreased from 63.05 to 43.18 and it was found that the rates of the reaction did not show any appreciable change. This seems to mean that the change in the dielectric constant of the medium had no effect on the rates of reaction in this [CoIIHEDTAH2O]- and Cu2+ systems.
At constant concentration of all the reactants, the effect of added ions on the rates of reaction was investigated by varying the concentration of acetate ion (CH3COO-) from 30x10-3 – 130x10-3 mol dm-3 and noting the rates of the reactions. The same was repeated for magnesium ion (Mg2+). For this system, the rates of reaction were found unaffected by the presence of either Mg2+ or CH3COO-The temperature dependence of rates on this reaction was investigated at 350C, 400C, 500C, 550C and 600C respectively.
It was found that increase in temperature increases the rates of reaction. The plot of logkobs versus the reciprocal of the square of temperature is linear, hence the activation parameters were evaluated.