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Homework Help: Autoionization of water

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data
    i was wondering if anyone knows why water is ignored in the autoionization of water? thanks


    2. Relevant equations
    H2O+H2O= H3O+OH
    Kc=[H][OH]


    3. The attempt at a solution
     
  2. jcsd
  3. Mar 29, 2009 #2

    Ygggdrasil

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    2017 Award

    In an aqueous solution (i.e. a solution where water is the solvent), the concentration of water is about 55M. Any reactions that occur in water that use water as a reactant or product will not significantly change the concentration of water in the solution. Therefore, one can treat [H2O] as a constant that gets added into the equilibrium constant.
     
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