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PH help?

  1. Dec 20, 2004 #1
    pH help??

    This is the question i need help in:
    A 0.200 M solution of a weak base in water has a pH=10.40. Calculate the value of kb for this base.

    I know the answer but i need help on how to get that answer. Thanks
  2. jcsd
  3. Dec 20, 2004 #2


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    Homework Helper

    If its a weak base then it doesn't diassociates completely in OH ions, so you need to use the equilibrium solution.
  4. Dec 21, 2004 #3
    This may help: see post #5 here.
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