Henderson for Titrations

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Helen Leka 1H
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Joined: Fri Sep 26, 2014 2:02 pm

Henderson for Titrations

Postby Helen Leka 1H » Sat Dec 13, 2014 7:27 pm

I'm a little confused as to when we are supposed to use the hendersen hasselbalch equation for titrations. I thought we were only supposed to apply them to buffers but in the book they used it for a titration problem. Can someone clarify when we are supposed to use it? thanks!

HelenMach 1J
Posts: 12
Joined: Fri Sep 26, 2014 2:02 pm

Re: Henderson for Titrations

Postby HelenMach 1J » Sat Dec 13, 2014 7:40 pm

"Look at the log part of the HH equation. Suppose that the salt form and the acid form were equal concentrations. That means that the ratio is 1 and the log of 1 is 0. The HH equation then becomes:
pH = pKa
This is an important (and useful) result. It can be used to determine an uknown Ka by carrying out a titration. It is commonly discussed in the area of acid-base titrations." -ChemTeam

So yes you can use it for titration when the salt and acid are equal, thus cancelling out the log.

Hi! We have the same name (:

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