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The conjugate base of H 2 ​ P O 4 − ​ is: A H P O 4 2 − ​ B P 2 ​ O 5 ​ C H 3 ​ P O 4 ​ D P O 4 3 − ​

The conjugate base of H2​PO4−​ is:

A

HPO42−​

B

P2​O5​

C

H3​PO4​

D

PO43−​

Grade:11

1 Answers

Rituraj Tiwari
askIITians Faculty 1792 Points
3 years ago
The concept of conjugate Acid-Base pair was given by Lowry-Bronsted Theory.
According to the theory:
Acids are proton(H+)donors.
Bases are proton(H+)acceptors.
Hence, in order to get the conjugate base of a species, we should consider that substance as an acid and vice versa.
For example,
H2​SO4​→HSO4−​+H+
Therefore,conjugate base ofH2​SO4​isHSO4−​.
Using this logic, for the given example:
H2​PO4−​→HPO4−2​+H+
Hence, conjugate base ofH2​PO4−​isHPO4−2​.

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