Question
Chemistry Question on Equilibrium
Which among the following species can act as an acid as well as base according to Bronsted-Lowry theory?
A
HSO4-
B
H3O+
C
Cl–
D
SO42-
Answer
HSO4-
Explanation
Solution
The HSO4- ion, known as the bisulfate ion, can act as an acid by donating a proton, forming H+ and SO42-. It can also act as a base by accepting a proton, forming H2SO4.
H3O+ (option B) is the hydronium ion and acts as an acid.
Cl- (option C) is the chloride ion and acts as a base.
SO42- (option D) is the sulfate ion and acts as a base.
Therefore, the correct answer is (A) HSO4-.