strength of polyprotic acids/bases

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Marni Kahn 1A
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strength of polyprotic acids/bases

Postby Marni Kahn 1A » Thu Nov 28, 2019 6:37 pm

Are polyprotic acids/bases necessarily stronger than monoprotic acids/bases?

nehashetty_2G
Posts: 67
Joined: Thu Jul 25, 2019 12:15 am

Re: strength of polyprotic acids/bases

Postby nehashetty_2G » Thu Nov 28, 2019 7:00 pm

No I don't think so. Being labeled polyprotic vs monoprotic just refers to how much one CAN donate; not how they normally donate. https://chem.libretexts.org/Bookshelves ... _Chemistry)/Acids_and_Bases/Monoprotic_Versus_Polyprotic_Acids_And_Bases/Polyprotic_Acids_and_Bases_1
This link has some tables that include the Ka of various acids and there are some monoprotic acids with higher Ka than some polyprotic acids, meaning they are stronger.

805307623
Posts: 61
Joined: Fri Aug 09, 2019 12:17 am

Re: strength of polyprotic acids/bases

Postby 805307623 » Fri Nov 29, 2019 2:32 pm

Monoprotic acids contain just one hydrogen ion whereas polyprotic acids contain two or three hydrogen ions. This makes many assume that polyprotic acids are stronger than monoprotic acids because they contain more hydrogen ions, but that's not necessarily true. Polyprotic acids only let go of one hydrogen sometimes, while keeping their other hydrogen ions attached.


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