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amphoterism

amphoterism in Medicine

amphoterism am·pho·ter·ism (ām'fə-těr'ĭz'əm, ām-fŏt'ə-rĭz'əm)
n.
The quality of exhibiting the characteristics of an acid and a base and having the capacity to react either as an acid or a base.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Article for amphoterism

in chemistry, reactivity of a substance with both acids and bases, acting as an acid in the presence of a base and as a base in the presence of an acid. Water is an example of an amphoteric substance. The dissolution of hydrogen chloride (an acid) and ammonia (a base) in water may be represented, respectively, by the following equations:

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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