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A species that is amphoteric can act as a acid or a base. Dr. Lavelle mentioned in class how there are a diagonal band of amphoteric oxides that closely matches the diagonal band of metalloids. You would have to look at whether or not it can react with both acids and bases in a neutralization reaction. A species that is amphiprotic can either donate or accept a proton. Therefore, an amphiprotic species is amphoteric by the Bronsted definition of acids and bases. A very common example of this is water. It can accept a proton to form a hydronium ion or it can donate a proton to form a hydroxide ion. Water thus is amphiprotic and amphoteric.
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