Amphoteric Compounds

  • Thread starter Seinfeld4
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  • #1
Seinfeld4
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Homework Statement



The Ka of H2PO4 is 6.3 * 10^-8. The Ka of HS is 1.3 * 10^-13. Write a formula for the reaction of these substances and explain your results. Both are amphoteric.

The Attempt at a Solution



The formula is:

H2PO4 + HS <--> HPO4 + H2S

I figured that the H2PO4 will act more like the acid in this particular situation because it has a higher value of Ka. So, H2PO4 will donate a proton while HS will recieve a proton.

Is this the correct train of thought?

Thanks.
 

Answers and Replies

  • #2
Borek
Mentor
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Is this the correct train of thought?

Yes. Just don't ignore charges - use [noparse]-[/noparse] to get -.
 

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