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Homework Help: Analytical Chemistry: Calculate the pH.

  1. Aug 22, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the pH of 5.0 x 10^-8 M HCLO4. What fraction of the total H+ in this solution is derived from dissociation of water?

    2. Relevant equations

    3. The attempt at a solution

    The only thing I know to do is take -log(5.0 x 10^-8) .
  2. jcsd
  3. Aug 23, 2013 #2


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    Staff: Mentor

    That's not correct in this case, as it yields pH above 7, which suggests - quite nonsensically - that acid solution is slightly basic. Besides, question contains a strong hint telling you why this approach yields incorrect result.

    Compare discussion here: pH of a strong acid.
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