Chemistry

What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate?

How do I start this problem

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1. Use the Henderson-Hasselbalch equation.
pH = pKa + log[(base)/(acid)]
Show your work if you get stuck.

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posted by DrBob222
2. well the only problem im having is finding the pKa

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posted by LT
3. My quant book lists 1.34 x 10^-5 for Ka. And Wikipedia lists a pKa of 4.88 which is almost the same, but not quite. Take your pick.

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posted by DrBob222
4. i think i will choose the 4.88 thank you

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posted by LT

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