In the equilibrium system described by: po43-(aq) + h2o(1) = hpo42-(aq) + oh-(aq) brønsted-lowry theory would designate: a) po43- and h20 as the bases b) h20 and oh as a conjugate pair c) hpo42- and oh"" as the acids d) hpo42- and h20 as a conjugate pair e) po43-as amphiprotic

The correct option is:  B) H₂0 and OH⁻ as a conjugate pair

Explanation:

According to Brønsted-Lowry theory, the acids are the chemical substances that form a conjugate base by donating a proton and bases are the chemical substances that form conjugate acid by accepting a proton.

In the given chemical reaction: PO₄³⁻(aq) + H₂O(l) ⇄ HPO₄²⁻(aq) + OH⁻(aq)

According to Brønsted-Lowry theory, PO₄³⁻ and OH⁻ are bases. Whereas, H₂O and HPO₄²⁻ are acids.

Also, PO₄³⁻ and HPO₄²⁻ are the conjugate acid-base pair; and H₂O and OH⁻ are the conjugate acid-base pair.