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Homework Help: BIOCHEM: buffer question

  1. Oct 10, 2012 #1
    BIOCHEM: buffer question!!!

    You have a sample of 50 mL of 0.2 M formic acid, which has a pKa of 3.75 (Ka = 1.78x10-4). How much 2 M KOH must be added to adjust the pH of the sample to 3.75?

    The correct answer is 2.5mL

    I tried using the henderson hasslebach equation and I just cannot wrap my head around how to go about solving it. It should be simple but i get into way to many steps and still come out with the wrong answer HELPPP
  2. jcsd
  3. Oct 10, 2012 #2


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    Staff: Mentor

    Re: BIOCHEM: buffer question!!!

    What happens in the solution of the formic acid when you add KOH?
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