Some ions are classed as amphoteric, being able to react with either an acid or a base. This is also true of some compounds with ionic character, typically oxides or hydroxides of less-electropositive metals (so the compound also has significant covalent character), such as zinc oxide, aluminium hydroxide, aluminium oxide and lead(II) oxide.
some ions are classed as amphoteric being able to react with either an acid or a base this is also true of some compounds with ionic character typically oxides or hydroxides of less-electropositive metals (so the compound also has significant covalent character) such as zinc oxide aluminium hydroxide aluminium oxide and lead(ii) oxide