Henderson-Hasselbalch Equation

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Rachna Goli 3E
Posts: 24
Joined: Fri Sep 25, 2015 3:00 am

Henderson-Hasselbalch Equation

Postby Rachna Goli 3E » Thu Dec 03, 2015 10:02 am

Why is it that you calculate the pH of a weak acid or base using the Henderson-Hasselbalch equation, but you don't use it for strong acids and bases?

304579397
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

Re: Henderson-Hasselbalch Equation

Postby 304579397 » Thu Dec 03, 2015 11:56 am

Since weak acids and weak bases barely dissociate, we use the Henderson-Hasselbalch equation to approximate the pH of buffer solutions using initial concentrations as addition of a small amount of acid or base does not alter the pH of a buffer solution. For strong acids and bases we can directly use -log[H3O+] or -log[OH-] to get the pH of the solution.

zach devereux 1C
Posts: 18
Joined: Fri Sep 25, 2015 3:00 am

Re: Henderson-Hasselbalch Equation

Postby zach devereux 1C » Sun Dec 06, 2015 10:19 am

Do you have to use the Henderson-Hasselbalch Equation or can you simply use an ICE box?


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