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The redox system Fe(III)/Fe(II) oxalate at platinum and mercury electrodes

โœ Scribed by J. Llopis; R. Posado

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
878 KB
Volume
13
Category
Article
ISSN
0013-4686

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โœฆ Synopsis

The dissociation equilibria of the complex ions present in a solution of Fe(III) and/or Fe(H) oxalate systems depend upon the pH, since H&,0, is a weak acid. Equilibrium diagrams have been drawn from the best information available about stability constants of these systems. Absorption spectra suggest that the octahedral confIguration of the complexes is preserved and the dissociatron is concerned with a process of aquation in the first co-ordination sphere. A study of the polarographic behaviour shows that both electron exchange at the electrode surface and setting of the dissociation equilibria, are very fast. Impedance measurements of platinum and mercury electrodes immersed in solutions of Fe(III)/Fe(H) oxalate systems have been carried out. The results confirm the fast exchange of electrons at the electrode interface and the important role played by adsorption in the mechanism of this electrode reaction.

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