Science Fair Project Encyclopedia
Amphoteric describes something made of, or acting like, two components.
In chemistry, it indicates a substance that can react with either an acid or base. Examples include amino acids and water. Many metals, such as zinc, tin, aluminium and beryllium, have amphoteric oxides. For example, zinc oxide ZnO reacts differently depending on the pH of the solution:
- ZnO + 2H+ → Zn2+ + H2O
- ZnO + H2O + 2OH- → [Zn(OH)4]2-
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