1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar

    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted