posted by Symone .
Given .300 L of a buffer solution that is .250 M HC2H3O2 and .50 M NaC2H302, what is the new pH if .0060 mol HCL is added? what about .0060 mol NaOH?
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.