Homework Help: AP Chemistry

Posted by Davis on Monday, April 9, 2012 at 5:09pm.

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 - DrBob222, Monday, April 9, 2012 at 5:47pm
Use the Henderson-Hasselbalch equation.
Lactic acid is the acid.
sodium lactate is the base.
AP Chemistry - Davis, Monday, April 9, 2012 at 5:59pm
DrBob--How do I determine the Pka value?
AP Chemistry--to DrBob - Davis, Monday, April 9, 2012 at 5:59pm
How do I figure out the Pka value?
AP Chemistry - DrBob222, Monday, April 9, 2012 at 6:01pm
Watch.
pH = -log(H^+)
pOH = -log(OH^-)
pKa = -log Ka
pKb = -log Kb
Do you get it? p means -log.
AP Chemistry--to DrBob - Davis, Monday, April 9, 2012 at 6:12pm
Thanks Dr. Bob!

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