Polyprotic Acid pH

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JChen_2I
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Joined: Fri Aug 09, 2019 12:17 am

Polyprotic Acid pH

Postby JChen_2I » Thu Jan 16, 2020 10:24 pm

Is it right to say that the second deprotonations of all polyprotic acids (but sulfuric acid) can be ignored when calculating pH?

Chem_Mod
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Re: Polyprotic Acid pH

Postby Chem_Mod » Thu Jan 16, 2020 10:47 pm

In the book problems, they explicitly say to ignore the second deprotonations bc the Ka values are extremely small. Likewise, if it is not explicitly said on a problem, look at the Ka value and determine if there is any significant protonation occurring.


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