Posted by Symone on Sunday, December 5, 2010 at 8:58pm.
The Henderson-Hasselbalch equation works all buffer problems.
i see that the equation is pH=pKa+log[base]/[acid]. but i do not know how to get pKa
The acid is acetic acid. Either in your problem or in your text the Ka should be listed as close to 1.8E-5 which is a pKa of 4.74 (pKa = -log Ka). Use the value in your text or notes, not the one I used. The base is acetate. The acid is acetic acid in the HH equation.
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