Direction of Reaction of Polyprotic Acids

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Jason Wu 1E
Posts: 60
Joined: Thu Jul 25, 2019 12:15 am

Direction of Reaction of Polyprotic Acids

Postby Jason Wu 1E » Fri Dec 06, 2019 9:51 am

When do you know if a polyprotic acid will release a second H+ ion or instead pick another one up to form an HA compound? For example, when do you know if H2PO4- will release H+ to form HPO4 2- or instead back to H3PO4?

alicechien_4F
Posts: 67
Joined: Sat Jul 20, 2019 12:15 am

Re: Direction of Reaction of Polyprotic Acids

Postby alicechien_4F » Fri Dec 06, 2019 1:32 pm

It depends on the pH of the solution that it is in. You have to compare the pKa with the pH to see if the acid will protonate or be deprotonated. Hope this helps!

Ashley Osorio
Posts: 54
Joined: Thu Jul 11, 2019 12:17 am

Re: Direction of Reaction of Polyprotic Acids

Postby Ashley Osorio » Fri Dec 06, 2019 1:34 pm

Can you elaborate on that? What are we looking for when comparing the pH and pKa?


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