A substance that will reduce aqueous iron 3 ions to iron 2 ions
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Ferric ions in solution can be reduced to ferrous ions by using hydrogen sulphide.
H2S + Fe3+(aq) →Fe2+(aq) + 2H+(aq) + S(s)
H2S + Fe3+(aq) →Fe2+(aq) + 2H+(aq) + S(s)
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H2S + Fe3+(aq) →Fe2+(aq) + 2H+(aq) + S(s)
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