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If the compound can act as both an acid and a base, the compound is amphoteric. The most common example is H2O. It can gain a proton to become a hydronium ion (H3O+) or lose a proton to become a hydroxide ion (OH-).
Yeah, Lavelle hasn't really gone over amphoteric compounds in lecture yet, so I think it would be best to just know that H2O is the standard amphoteric compound because it has the same concentration of H+ and OH- ions.
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