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(1) A substance that dissociates in water producing H+ions and reacts with a base to form a salt. (2) Possessing a pH of <7.0 (see acidity). In environmental science, it is used mainly in relation to water, soil, sediment and rock.

[See alsoacid rain, acidification, alkali, alkalinity]

Andrew D.ThomasUniversity of Salford
10.4135/9781446247501.n39
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