Balancing redox reactions occurring in acidic solutions

  1. 1. The problem statement, all variables and given/known data
    Balance the following redox reactions occurring in an acidic solution.

    2. Relevant equations

    3. The attempt at a solution
    1.) half reactions:
    a.) reduction: I-(aq)----->I2(s)
    b.) oxidation: PbO2(s)------>Pb2+(aq)
    2.) balance Oxygens and Hydrogens
    3.) add electrons to balance equations
    b.) 4I--->4I2+4e-
    4.) cancel out the electrons and combine the half reactions
  2. jcsd
  3. Borek

    Staff: Mentor

    Last edited by a moderator: Aug 13, 2013
  4. I don't understand how to insert the number of electrons on both sides to balance the equations and cancel out the electrons.
  5. Borek

    Staff: Mentor

    Balance atoms first, then use electrons to balance charge in half reaction. As long as charge on both sides is different, equation is not balanced.
    Last edited by a moderator: Aug 13, 2013
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