Polyprotic acid question

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chloewinnett1L
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Joined: Fri Sep 28, 2018 12:20 am

Polyprotic acid question

Postby chloewinnett1L » Thu Jan 24, 2019 10:06 pm

How do we know when an acid will continue to ionize after an initial ionization? Will every single acid with multiple hydrogen atoms ionize a second/third/etc. time, and if not, how can we tell the difference between those that will and those that will not?

Nada AbouHaiba 1I
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Joined: Fri Sep 28, 2018 12:28 am
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Re: Polyprotic acid question

Postby Nada AbouHaiba 1I » Thu Jan 24, 2019 10:34 pm

It mentioned in the textbook that if the second protonation is less than 1/1000 of the original one you can just solve for the first one and use that value of H3O/OH to calculate pH/pOH. It's because the second protonation would be so small there it would make no difference.
H2SO4 is the exception in the sense that it doesn't have a KA1 because it's a strong acid that completely disassociates, so you would actually do an ICE table with KA2.

Hope this helps!


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