Question

The conjugate acid and base of ${HPO^{2-}_{4}}$ respectively are

• A. $\ce{PO^{3-}_{4}}$ and $\ce{H_2 PO^{-}_{4}}$
• B. $\ce{H_2 PO^{-}_{4}}$ and $\ce{PO^{3-}_{4}}$
• C. $\ce{H_3 PO_{4}}$ and $\ce{PO^{3-}_{4}}$
• D. $\ce{H_2 PO^{-}_{4}}$ and $\ce{H_2PO_{4}}$

Answer 1

Answer: (B)

$\ce{H_2 PO^{-}_{4}}$ and $\ce{PO^{3-}_{4}}$

Answer 2

{\underset{\text{Acid}}{ {HPO^{2-}_4}}$+ H^+ ->$\underset{\text{Conjugate base}}{ {PO^{3-}_4}} }
{\underset{\text{Base}}{ {HPO^{2-}_4}}$+ H^+ ->$\underset{\text{Conjugate acid}}{ {H_2PO^-_4}} }