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Topic: Fe2+ and H2O2 chemistry  (Read 16825 times)

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Offline SinkingTako

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Fe2+ and H2O2 chemistry
« on: October 19, 2013, 04:24:20 AM »
When Fe2+ is reacted with H2O2, in the presence of H+, the following reaction should take place:

2Fe2+ +H2O2 +2H+  :rarrow: 2Fe3+ +2H2O

However, in the lab, When H2O2 is added to the apple green solution of Fe2+ (without any acid), the solution turns orange, which is very very similar in colour to that of the Fe3+ solution. When acid is added, the solution changes colour back to the apple green.

Yet I think the green solution of H2O2, acid and Fe2+ formed is not simply Fe2+ again. When NaOH is added, a almost black ppt is formed, which is distinctly different from the brick-red ppt of Fe(OH)3, or dirty green ppt of Fe(OH)2. Also HCl (which is the acid I used) would definitely not been able to reduce Fe3+ to Fe 2+ again.

What can this black solid be, and what is the reaction of H2O2 and Fe2+?
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Offline Hunter2

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Re: Fe2+ and H2O2 chemistry
« Reply #1 on: October 20, 2013, 05:32:52 AM »

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