Henderson-Hasselbach equation

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Michelle Dela Rosa 1D
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Henderson-Hasselbach equation

Postby Michelle Dela Rosa 1D » Thu Dec 03, 2015 10:31 am

Are we only allowed to use the Henderson-Hasselbach equation for questions involving buffers, thereby using (R)ICE boxes for every other calculation of pH?

Shreya Banerjee 2F
Posts: 24
Joined: Fri Sep 25, 2015 3:00 am

Re: Henderson-Hasselbach equation

Postby Shreya Banerjee 2F » Thu Dec 03, 2015 11:14 am

You can only use the Henderson-Hasselbach equation when you have an weak acid and its conjugate base, or a weak base and its conjugate acid. Usually, that means a buffer, but you can use it any time you have those conditions. When you have anything else, it's usually easier to just use the ICE table. Otherwise, you could still calculate the concentration of the conjugate base/acid with the ICE table and put that in the Henderson Hasselbach equation, but that is a bit more of a hassle than just taking the -log of [H3O+].

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