# AP Chemistry

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Calculate the pH of a 75.0 ml solution containing 0.85 M lactic acid after the addition of 0.0225 moles NaL (assume a negligible volume change.)

• AP Chemistry -

Use the Henderson-Hasselbalch equation.
Lactic acid is the acid.
sodium lactate is the base.

• AP Chemistry -

DrBob--How do I determine the Pka value?

• AP Chemistry--to DrBob -

How do I figure out the Pka value?

• AP Chemistry -

Watch.
pH = -log(H^+)
pOH = -log(OH^-)
pKa = -log Ka
pKb = -log Kb
Do you get it? p means -log.

• AP Chemistry--to DrBob -

Thanks Dr. Bob!

• AP Chemistry -

kkm

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