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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

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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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