Polyprotic

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Annie Ye
Posts: 106
Joined: Wed Sep 18, 2019 12:22 am

Polyprotic

Postby Annie Ye » Thu Dec 05, 2019 1:16 pm

How do we know if a chemical formula is more polyprotic? How do we determine the strength?

Jainam Shah 4I
Posts: 74
Joined: Fri Aug 30, 2019 12:16 am

Re: Polyprotic

Postby Jainam Shah 4I » Thu Dec 05, 2019 1:23 pm

Polyprotic acids are specific acids that are capable of losing more than a single proton in acid-base reactions. From the molecular formula if you have more than one hydrogen the acid can be Polyprotic. To determine the strengths between Polyprotic acids with the same number of hydrogen look at the electronegativity of the non-hydrogen bonded atom. Once you lose one hydrogen it becomes much harder for to lose another one which is why Ka values increase.

Audrie Chan-3B
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Polyprotic

Postby Audrie Chan-3B » Thu Dec 05, 2019 6:22 pm

If the chemical can either donate more than one proton or accept more than one proton, it is polyprotic. It would be more polyprotic if you compare and see which molecule can donate/accept more.

904914037
Posts: 65
Joined: Wed Sep 18, 2019 12:16 am

Re: Polyprotic

Postby 904914037 » Thu Dec 05, 2019 8:46 pm

Another way of finding out if it is a polyphonic species is to look at the charge of the anion of the species. For instance, in H2SO4, Sulfate has a -2 charge, meaning it is capable of accepting two protons whereas Br- is very unlikely to accept two protons. You can apply the same idea to H3PO4 and H2C2O4 (because C2O4 has a -2 charge).

Debora Fernandez Clemente_ 4H
Posts: 52
Joined: Wed Sep 18, 2019 12:21 am

Re: Polyprotic

Postby Debora Fernandez Clemente_ 4H » Sat Dec 07, 2019 10:19 pm

On the outline posted for Acid and Bases and Structures Properties, one of the focus says mentions Box 6E.1. Are we supposed to memorize these values?

rachel liu 3k
Posts: 56
Joined: Sat Aug 17, 2019 12:16 am

Re: Polyprotic

Postby rachel liu 3k » Sat Dec 07, 2019 11:34 pm

Annie Ye wrote:How do we know if a chemical formula is more polyprotic? How do we determine the strength?


more than 1 ionizable H+, such as H2PO4. The titration curve will have two equilibrium points because there are two points in which the OH- and H+ concentration equal one another.

Annie Ye
Posts: 106
Joined: Wed Sep 18, 2019 12:22 am

Re: Polyprotic

Postby Annie Ye » Sun Dec 08, 2019 6:10 pm

can bases be polyprotic? If so, what are the chemical equations representing that?


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