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Homework Help: Reaction of Manganese and hydrogen peroxide

  1. May 28, 2010 #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
     
  2. jcsd
  3. May 30, 2010 #2

    Borek

    User Avatar

    Staff: Mentor

    Mn2O3 is not that easy to make.
     
  4. May 30, 2010 #3
    I went for MnO2. I also used the redox reaction for hydrogen peroxide under basic conditions
     
  5. May 30, 2010 #4

    Borek

    User Avatar

    Staff: Mentor

    Sounds reasonable.
     
    Last edited by a moderator: Aug 13, 2013
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