Question

On what basis do you classify bronsted base on anion?

Answer 1

A Bronsted base is a species capable of accepting a proton, it may be an anion or a compound with a lone pair of electrons.

e.g. OH^- , NH₃ etc.

NH₃ + H₂O ⇌ NH₄⁺ + OH^-
OH^- + H⁺ → H₂O
Here OH^- behave as bronsted base as it accept a proton and hydroxide is an anion. So, anion behave as bronsted base.