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Reaction of Manganese and hydrogen peroxide

  • Thread starter Moogie
  • Start date
  • #1
168
1
Hi

In a recent lab I reacted Mn2+ ions with NaOH. The Mn 2+ ions exist in this equilibria

[Mn(H20)6]2+ + H20 <=>
[Mn(H20)5OH]+ + H30+

Addition of NaOH ions shift this equilibria to the left (by removing protons) until Mn(OH)2 is precipitated

Hydrogen peroxide is then added and some gas is released and a brown precipiate formed. I presume the peroxide is oxidising the Mn2+ ions but I don't know what the precipitate is or how to balance the reaction. Some possibilities are Mn02 and Mn2O3 which are manganese oxides in a higer oxidation state.

thanks
 

Answers and Replies

  • #2
Borek
Mentor
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Mn2O3 is not that easy to make.
 
  • #3
168
1
I went for MnO2. I also used the redox reaction for hydrogen peroxide under basic conditions
 
  • #4
Borek
Mentor
28,301
2,685
Sounds reasonable.
 
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