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


Postby Annie Ye » Mon Dec 02, 2019 3:53 pm

Write the chemical equations of the two proton transfer equilibria that demonstrate the amphiprotic character of (a) HCO32; (b) HPO422. Identify the conjugate acid–base pairs in each case.

Ryan Yee 1J
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Re: 6A.11

Postby Ryan Yee 1J » Mon Dec 02, 2019 5:30 pm

HCO3- as an acid, HCO3-(aq) + H2O(l) <--> H3O+(aq) + CO32-(aq)
This has HCO3- acting as the acid and CO32- acting as the base, and H2O as the base with H3O+ as the acid.
With HCO3- as a base, H2O(l) + HCO3-(aq) <--> H2CO3(aq) + OH-(aq),
This has HCO3- acting as the base and H2CO3 acting as acid, with H2O acting as acid and OH- acting as base.

For part b,
With HPO42- as an acid, HPO42-(aq) + H2O(l) <--> H3O+(aq) + PO43-(aq)
HPO42- acts as the acid and PO43- acts as the base, H2O acts as base with H3O+ acting as acid
With HPO42- as a base, HPO42-(aq) + H2O(l) <--> H2PO4-(aq) + OH-(aq)
HPO42- acts as the base and H2PO4- acts as the acid, H2O acts as the acid and OH- acts as base

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