Reaction of Manganese and hydrogen peroxide

[Moogie]

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

 

[Borek]

Mn₂O₃ is not that easy to make.

 

[Moogie]

I went for MnO2. I also used the redox reaction for hydrogen peroxide under basic conditions

 

[Borek]

Sounds reasonable.