Question

what is the formula for the conjugate acid of dihydrogen phosphate, $h_{2}po_{4}^{-}$?
$\bigcirc hpo_{4}$
$\bigcirc h_{3}po_{4}$
$\bigcirc oh^{-}$
$\bigcirc h_{2}o$

Explanation:

According to the Brønsted - Lowry acid - base theory, a conjugate acid is formed when a base accepts a proton (\(H^+\)). For the dihydrogen phosphate ion (\(H_2PO_4^-\)), when it accepts a proton (\(H^+\)), the reaction is \(H_2PO_4^-+H^+\to H_3PO_4\).

Answer:

B. \(H_3PO_4\)