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I know that you can always use Henderson Hasselbalch's equation when doing buffer problems, but when is it acceptable to use in a titration problem? (i.e. strong acid-strong base, strong acid-weak base, etc.)
You can always use the Henderson-Hasselbalch when a buffer problem shows up in a titration calculation, i.e. when you know the concentration of a weak acid and it's conjugate base, or the concentration of a weak base and its conjugate acid. You usually have the Pka already, or you can find it by taking the -log of the Ka value. Then you can find your pH. This will save a lot more time than drawing out another I.C.E. table and trying to find the concentration of H3O+ or -OH.
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