Question

Species acting as both Bronsted acid and base in water is -

• A. $HS{O}_4^{-}$
• B. $N{a}_{2}C{O}_3$
• C. $N{H}_3$
• D. $O{H}^{-}$

Answer 1

The correct option is A $HS{O}_4^{-}$

In water,
$HS{O}_4^{-}$ can accept and donate a proton in water
$HS{O}_4^{-}+H^{+}\to H_{2}S{O}_4$
$HS{O}_4^{-}\to H^{+}+S{O}_4^{2-}$
Hence, $HS{O}_4^{-}$ acts as both acid and base according to Bronsted Lowry theory.