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Simple Algerbraic Manipulation is Confusing Me

  1. Feb 4, 2008 #1
    I'm working on a chemistry problem and I'm trying to follow the derivation for % ionization (of a weak acid or base) but I can't seem to understand how rearrangement of eq. 6 results in eq. 7.

    In more general terms, I started with the Hendreson Hasselbalch equation:

    pH = pka + log(A-/AH)

    What I want to find is, A-/(AH + A-)

    This is giving me a real headache, can anyone help?
     

    Attached Files:

  2. jcsd
  3. Feb 5, 2008 #2
    Bring the A- to the LHS of (6). Add 1 to both sides and convert the LHS to a single fraction. Invert the fractions and multiply by 100.
     
  4. Feb 5, 2008 #3
    Thanks, I've got it now.
     
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