May 29, 2020, 01:09:38 AM
Forum Rules: Read This Before Posting

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

0 Members and 1 Guest are viewing this topic.

Offline SinkingTako

  • Regular Member
  • ***
  • Posts: 72
  • Mole Snacks: +8/-0
  • Gender: Female
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+?

Offline Hunter2

  • Sr. Member
  • *****
  • Posts: 1762
  • Mole Snacks: +130/-44
  • Gender: Male
  • Vena Lausa moris pax drux bis totis
Re: Fe2+ and H2O2 chemistry
« Reply #1 on: October 20, 2013, 05:32:52 AM »

Sponsored Links