[CHM 112] Lab

[Andrew J. Pounds]

On 04/14/2013 05:31 PM,  wrote:
> I'm confused on how to find the pKa of the unknown in the lab. My only 
> idea would to be to find the [H+] and do an icebox. Is that right?

In part II number 3, when you recombine the neutralized half of the weak 
acid with the half that you kept separate you have made a "buffer".  You 
combined solution contains a weak acid that is titrated halfway to its 
endpoint.  By definition, the pH of this solution is equal to the pKa of 
the weak acid.


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627

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