Question
Species acting as both Bronsted acid and base is
A.
$${\left( {HS{O_4}} \right)^{ - 1}}$$
B.
$$N{a_2}C{O_3}$$
C.
$$N{H_3}$$
D.
$$O{H^{ - 1}}$$
Answer :
$${\left( {HS{O_4}} \right)^{ - 1}}$$
Solution :
$${\left( {HS{O_4}} \right)^ - }$$ can accept and donate a proton
$$\eqalign{
& {\left( {HS{O_4}} \right)^ - } + {H^ + } \to {H_2}S{O_4}\,\,{\text{(acting as base)}} \cr
& {\left( {HS{O_4}} \right)^ - } - {H^ + } \to S{O_4}^{2 - }.\,\,\,\,{\text{(acting as}}\,{\text{acid)}} \cr} $$