## Chemistry: Molecular Approach (4th Edition)

Amphoteric substances are able to act as acids or bases. $H_2O$ is an amphoteric substance, being able to act as an acid, donating a proton and becoming $OH^-$, and act as a base, accepting a proton and becoming $H_3O^+$.
Amphoteric substances are able to act as acids or bases. $H_2O$ is an amphoteric substance, being able to act as an acid, donating a proton and becoming $OH^-$, and act as a base, accepting a proton and becoming $H_3O^+$.