The influence of perchlorate, chloride and sulphate ions on the reversible electron transfer redox system formula was examined in the acidic solution by the stopped-flow spectrophotometry. The positive salt effect, typical of reactions between similarly charged ions, and an unusually strong accelerating effect of chloride and sulphate ions on the reactions rates were observed. The latter could be explained in terms of complex formation between the iron ions and the anions investigated with the resultant complexes reacting faster than respective iron-aqua complexes.
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