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Finally, amphoteric detergents have either a positively or negatively charged ion, depending on the pH of the system they are incorporated into.
Proteins can also be amphoteric compounds - a compound that can take on a negative or positive charge depending on the surrounding conditions.
The presence of both of these ions makes water an amphoteric substance.
Amino acids are amphoteric organic acids that are able to biochemically react with both acids or bases.
The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid, since morphine is a phenolic amine.
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