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Acid solutions have a high [H+] , and basic solutions have a low [H+] (and therefore a high [OH−]). The pH of a solution is the negative logarithm of its [H+]. Low pH values indicateacids, and high pH values indicate bases. Even small changes in pH can be harmful to life. Buff er systems in organisms help to maintain pH within a narrow range.
■ A change of 2 pH units indicates what change in [H+]?
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