Question

6

Select the correct answer,
Which compound is a conjugate acid-base pair?
OA.
SOB.
H₂PO4 and HPO42-
H₂PO4 and HPO4²-
OC. H₂PO4 and PO
OD,
H₂PO4 and PO43-

edmentum

Answer 1

The correct answer is "H₂PO4 and HPO42-" (Option B).

Answer 2

A conjugate acid-base pair is represented by H₂PO₄ as an acid and its counterpart when it loses a proton, HPO₄²- as a base; they are a matched pair in the context of Bronsted-Lowry acid-base interactions.

Step-by-step explanation:

The compound which is a conjugate acid-base pair in the option is H₂PO₄ and HPO₄²-. When HPO₄²- accepts a proton (H+), it forms its conjugate acid H₂PO₄. Conversely, when H₂PO₄ loses a proton, it forms its conjugate base HPO₄²-. This pair of substances, one being able to donate a proton and the other able to accept one, constitutes a conjugate acid-base pair according to Bronsted-Lowry acid-base theory.