amphiprotic substance(两性物质)： a substance that can either donate or accept a proton is said to be amphiprotic. Example:HSO,[Fe(OH)(H2O)s]2+,HCO3,H2O,HS-etc the essence of acid-base reaction in Bronsted theory is proton transfer between two acid-base conjugate pairs,examples are given below: amphiprotic substance(两性物质)： a substance that can either donate or accept a proton is said to be amphiprotic. HCO3 - , H2O, HS- [Fe(OH)(H2O)5 ] etc 2+ HSO , 4 - Example: , the essence of acid-base reaction in Brønsted theory is proton transfer between two acid-base conjugate pairs, examples are given below: