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Homework Help: Chemistry) Buffers and Ph differences question

  1. Mar 14, 2012 #1
    1. The problem statement, all variables and given/known data

    A Chemist wishes to prepare 250mL of buffer that has a Ph of 4.50. Starting with 100mL of 0.12 mol L acetic acid and a supply of 0.10 mol L NaOh.
    1) explain how this can be done
    3) how much 0.20 molL NaOH must e added to this buffer to raise the pH to 5.1?
    3) if the same amount of 0.20 mol L NaOH were added to 250mL of Dionized water, what would the new pH be?

    2. Relevant equations

    I know the henderson equation has to be used somewhere but I'm honestly stumped at where to even start :blushing: any general push in the right direction would be seriously appreciated, It's a bonus Lab question, but I'd still like to get any extra marks I could :)
  2. jcsd
  3. Mar 14, 2012 #2


    User Avatar

    Staff: Mentor

    When you add NaOH to the solution of acetic acid, you neutralize it, producing sodium acetate. Just add enough to get a correct ratio given by the HH equation.
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