Which of the following species can act as both a Bronsted acid and a Bronsted base (amphiprotic) in — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

An amphiprotic species can both donate and accept a proton. $NH_3$ can accept a proton to form $NH_4^+$ (acting as a Bronsted base) and can donate a proton to form the amide ion $NH_2^-$ (acting as a Bronsted acid). The others are only proton acceptors.