Induction by Iron(II) of the Oxidation of Iodide by Dichromate - 1 of 2

When acidic dichromate and iodide solutions are mixed, no immediate reaction takes place, even though the electrochemical potentials predict that chromium(VI) should oxidize iodide to triiodide ion.

Addition of iron(II) solution brings about rapid formation of brown triiodide. A reasonable hypothesis for the mechanism is that dichromate oxidizes iron(II) to iron(III), and that iron(III) then oxidizes iodide to triiodide. How would you test this hypothesis?

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