Homework Help: chemistry

Posted by Lauren on Thursday, April 14, 2011 at 8:11am.

Lactic acid, C3H6O3, is found in sour milk. A solution containing 1.00g NaC3H5O3 in 100.0mL of 0.0500M C3H6O3 has a pH= 4.11.

Calculate the Ka of lactic acid

chemistry - DrBob222, Thursday, April 14, 2011 at 4:07pm
Let lactic acid = HL
The salt, then, is NaL.
I would use the Henderson-Hasselbalch equation but it can be done without that.
Substitute 4.11 for pH.
(base) in the HH equation = 1g/molar mass NaL.
(acid) in the HH equation = 0.05
Solve for pKa and convert to Ka.

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