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Homework Help: Ion electron balancing problem

  1. Apr 25, 2012 #1
    1. The problem statement, all variables and given/known data
    The problem is given like this "A student unsuccessfully tried to balance the following equation:
    Cr2O72-+Fe3++H+→Cr 3+ +Fe 2+ + H2O


    2. Relevant equations



    3. The attempt at a solution
    First tried to find the oxidation no.
    -8 -2 3+ 1+
    Cr2O72-+Fe3++H+
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 25, 2012 #2

    Borek

    User Avatar

    Staff: Mentor

    Show how you got -8.
     
  4. May 1, 2012 #3
    Thanks for pointing out my mistake !
     
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