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Author Topic: Conjugate Acid of HPO4-2  (Read 23198 times)

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jcais

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Conjugate Acid of HPO4-2
« on: July 13, 2006, 05:04:48 PM »

Hello,

I won't be able to see the teacher until next week. I took a test and got only this problem wrong so it is on my mind. It was
What is the conjugate acid of HPO4-2?

I put H+ because isn't it:
(HPO4)2-  (PO4)3- + H+ in the 3rd ionization?

Maybe I am missing something. Can someone please help me?

Thank you. ???
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Dan

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Re: Conjugate Acid of HPO4-2
« Reply #1 on: July 13, 2006, 11:33:14 PM »

I think the question is probably referring to

HPO42- + H3O+ <-----> H2PO4- + H2O

ie, HPO42- is acting as a base rather than an acid.

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sdekivit

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Re: Conjugate Acid of HPO4-2
« Reply #2 on: July 14, 2006, 07:33:28 AM »


What is the conjugate acid of HPO4-2?


an example:

H3PO4 + H2O <--> H2PO4- + H3O+

now we can say that H2PO4- is the conjugated base of H3PO4 and on the other hand we can say that H3PO4 is the conjugated acid of H2PO4-

the definition for the conjugated acid: the acid that will be formed when the base dissociates. Thus in the previous example:

H2PO4- + H2O --> H3PO4  + OH-

but it's actually the same.
now it should be no problem to answer this question ;)
« Last Edit: July 14, 2006, 07:38:31 AM by sdekivit »
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