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Jr. Member

Joined: 08 Apr 2020
Posts: 5
Location: Brazil

Need help whit iron redox

First of all, if i wrote anything wrong, feel free to correct me.

Hey guys, hope you good,
My teacher did some reactions using iron, but i didn't get everything right.
He used steel wool, hydrogen peroxide, H+ from ethanoic acid from vinegar and hypochlorite from solution.
On the first reaction he added some steel wool to a glass and added the vinegar, he explained that the iron went from Fe0 to Fe2+, cause of the H+.
Fe + H+ = Fe 2+ + H2
Until here i understood everything right i guess, but, in the same glass he added some hydrogen peroxide and the iron went from 2+ to 3+ but i don't get why and how.

On another glass he added some steel wool and some hypochlorite solution, straight away nothing happened, but then he adds some vinegar, and it went slowly to Fe3+ (only got this part cause of the color), but again, don't know why and how.

He also asked the cell potential of those reactions, if someone could help with this too, would be very grateful, thanks.

Distinguished Member

Joined: 27 Sep 2017
Posts: 418
Location: Berlin, Germany
 Ok Buddy. Iron is able to have different oxidation numbers. Basically + 2 and +3 In the First experiment iron goes from 0 to +2 by adding an acid in this case acetic acid (vinegar). Fe + 2 H+ => Fe2+ + H2 In the second test he add peroxide an oxidizer The oxidation number change from +2 to + 3. 2 Fe2+ + H2O2 + 2 H+ => 2 Fe3+ + 2 H2O In the third experiment he used another oxidizer Hypochlorite. This is alkaline and doesn't work. By adding vinegar the solution gets acidic. The oxidation number goes from 0 to + 3 directly. 2 Fe + 3 ClO- + 6 H+ =>2 Fe3+ + 3 Cl- + 3 H2O Cell potentials can be found in tables.

Jr. Member

Joined: 08 Apr 2020
Posts: 5
Location: Brazil

 ChenBeier wrote: Ok Buddy. Iron is able to have different oxidation numbers. Basically + 2 and +3 In the First experiment iron goes from 0 to +2 by adding an acid in this case acetic acid (vinegar). Fe + 2 H+ => Fe2+ + H2 In the second test he add peroxide an oxidizer The oxidation number change from +2 to + 3. 2 Fe2+ + H2O2 + 2 H+ => 2 Fe3+ + 2 H2O In the third experiment he used another oxidizer Hypochlorite. This is alkaline and doesn't work. By adding vinegar the solution gets acidic. The oxidation number goes from 0 to + 3 directly. 2 Fe + 3 ClO- + 6 H+ =>2 Fe3+ + 3 Cl- + 3 H2O Cell potentials can be found in tables.
thanks buddy
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