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Homework Help: Redox reaction equation

  1. Mar 14, 2007 #1
    1. The problem statement, all variables and given/known data
    Balance the following redox equation (in an acidic solution):

    Cu + NO3- -> NO2 + Cu2

    3. The attempt at a solution

    I got 4H+ + 2NO3- + Cu -> Cu+2+ + 2NO2 + 2H2O

    But my book told me the same thing, but without the H2[/sub]O:

    4H+ + 2NO3- + Cu -> Cu+2+ + 2NO2
  2. jcsd
  3. Mar 14, 2007 #2


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    Homework Helper
    Education Advisor
    Gold Member

    Your answer is better because YOURS is balanced. The book's answer, by dropping the water from the right-side is not balanced. Check the number of oxygens on the two sides!
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