Question

Species acting as both Bronsted acid and base is/are

• A. $HS{O}_4^{-}$
• B. $N{H}_3$
• C. $O{H}^{-}$
• D. All of the above

Answer 1

The correct option is D All of the above

A Bronsted-Lowry acid is any species that is capable of donating a proton.
A Bronsted-Lowry base is any species that is capable of accepting a proton.
$HS{O}_4^{-}$ can accept as well as can donate a proton.
$HS{O}_4^{-}+H^{+}\to H_{2}S{O}_4$ (acting as batse)
$HS{O}_4^{-}-H^{+}\to S{O}_4^{2-}$ (acting as acid)

both ammonia and hydroxyl ion can accept proton as well as can donate proton thus acting as Bronsted acid and base