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Balancing equation in basic solution

  1. Feb 13, 2008 #1
    [SOLVED] balancing equation in basic solution

    1. The problem statement, all variables and given/known data
    The alkaline solution of hypochlorite ions reacts with solid chromium(3)hydroxide to produce aqueous chromate ions and chloride ions. Write the net ionic equation for the reaction.


    2. Relevant equations


    3. The attempt at a solution
    bone:
    ClO(-)+Cr(OH)3=CrO4(2-)+Cl(-)
    ox:
    Clo(-)=Cl(-)
    ClO(-)=Cl(-)+H2O
    ClO(-)+2 H2O=Cl(-)+H2O+2 OH(-)
    ClO(-)+H2O+2e(-)=Cl(-)+2OH(-) | *3
    red:
    Cr(OH)3=CrO4(2-)
    Cr(OH)3+3H2O=CrO4(2-) (should be 1 H2O)
    Cr(OH)3+3H2O+9OH=CrO4+9H2O
    Cr(OH)3+9OH-3e=CrO4+6H2O | *2
    after adding them together
    3ClO+2Cr(OH)3+12OH=3Cl+2CrO4+9H2O

    both my equation and the answer in my book are balanced but the book answer has 4OH and 5 H2O, but mine 12 OH and 9 H2O. What did I wrong or how can I cancel some of the H2O-s and OH-s?

    Never mind found the problem..
     
    Last edited: Feb 13, 2008
  2. jcsd
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