Which of the following is a conjugate acid-base pair in the reaction represented by the equation below?
H2PO4 + H20 H3PO, + OH
H2PO, and H2O
b) H, PO, and OH
c) H2PO, and H3PO,
None of the above

  and

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

For the given reaction:

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base.

Similarly , is gaining a proton, thus it is considered as an base and after gaining a proton, it forms which is a conjugate acid.

Thus and is a conjugate acid-base pair in the reaction represented by the equation below

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