Polyprotic acids and bases

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JustinHorriat_4f
Posts: 90
Joined: Wed Sep 18, 2019 12:19 am

Polyprotic acids and bases

Postby JustinHorriat_4f » Sun Dec 01, 2019 11:44 pm

Hi, I know this is a dumb question, but what are polyprtoic acids and bases in simple terms. Can you also give examples?

Ashley Fang 2G
Posts: 81
Joined: Fri Aug 30, 2019 12:17 am

Re: Polyprotic acids and bases

Postby Ashley Fang 2G » Mon Dec 02, 2019 1:34 am

Polyprotic acids are acids that can lose more than one proton per molecule in acid-base reactions. Examples: H2SO4, H2CO3
Polyprotic bases are bases that can accept more than one proton per molecule in acid-base reactions. Examples: [SO4]2-, [CO3]2-

In titration curves, they will have multiple equivalence points (point in a titration where the amount of titrant added is enough to completely neutralize the analyte solution).
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christabellej 1F
Posts: 93
Joined: Sat Aug 17, 2019 12:17 am

Re: Polyprotic acids and bases

Postby christabellej 1F » Mon Dec 02, 2019 7:04 am

Another common example would be H3PO4. In polyprotic acids, the first Ka, which measures the strength of the acid when it donates its first proton, is usually the strongest. The subsequent Kas, which measure the strength of the acid as it donates its second (or third) proton is weaker because it is harder to remove a proton from a negatively charged molecule.


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