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March 28, 2017

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You have to prepare a pH 3.50 buffer and you have .10M HCOOH and .10M HCOONa, how many milliliters of each solution do you neeed for 1 liter of buffer

  • chemistry - ,

    Use the Henderson-Hasselbalch equation.
    You will need to look up Ka for formic acid and convert to pKa.
    Calculate the ratio Base/acid.

    Then acid + base = 1
    and base/acid = from above.
    Two equations and two unknowns. Solve for acid and base. I get something like 600 mL acid and 400 mL base but those are just close numbers.

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