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In acids: ZnO + 2H+ → Zn2+ + H2O
In bases: ZnO + H2O + 2OH- → [Zn(OH)4]2-
This effect can be used to separate different cations, such as zinc from manganese.
There are many other examples of chemical compounds which are also amphoteric, for the simplest example water:
Base (Proton Acceptor): H2O + HCl → H3O+ + Cl−
Acid (Proton Donor): H2O + NH3 → NH4+ + OH−
Aluminium hydroxide is as well:
Base (neutralizing an acid): Al(OH)3 + 3HCl → AlCl3 + 3H2O
Acid (neutralizing a base): Al(OH)3 + NaOH → NaAl(OH)4
Beryllium hydroxide is also amphoteric:
Base: Be(OH)2 + 2HCl → BeCl2 + 2H2O
Acid: Be(OH)2 + 2NaOH → Na2Be(OH)4
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Amphoterism". A list of authors is available in Wikipedia.|