Interaction | Reaction | Process Data Page
Pale green hexaaquairon(II) ion is oxidised by dense purple permanganate, or manganate(VII) ion, to mixture containing nearly colourless hydrated ions.This reaction can be used in a self-indicating titration in which a dark purple aqueous solution of permanganate is added to a very, very pale green an iron(II) solution. The permanganate decolourises as it is stirred into the iron(II) solution, which is oxidised to iron(III). The end point is persisting pale purple (pink) colour, which comes from the excess permanganate. Protons are provided by dilute sulfuric acid, as there are redox problems with most other mineral acids.Note the 5:1 mole ratio between Fe2+ and MnO4–.
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