Amphoteric is derived from the Greek word amphoteroi (ἀμφότεροι) meaning "both". Related words in acid-base chemistry are amphichromatic and amphichroic, both describing substances such as acid-base indicators which … See more

According to the Brønsted-Lowry theory of acids and bases, acids are proton donors and bases are proton acceptors. An amphiprotic molecule (or ion) can either donate or accept a proton, thus acting either as an … See more

Zinc oxide (ZnO) reacts both with acids and with bases:
This reactivity can be used to separate different cations, for instance zinc(II), which dissolves in base, from manganese(II), which doe… See more

Aluminium hydroxide is also amphoteric:
Beryllium hydroxide:
Chromium hydroxide: See more