Acid and Base
According to the definition used by environmental chemists, an acid is a substance that increases the hydrogen ion (H+) concentration in a solution and a base is a substance that removes hydrogen ions (H+) from a solution.
In water, removal of hydrogen ions results in an increase in the hydroxide ion (OH-) concentration. Water with a pH of 7.0 is neutral, while lower pH values are acidic and higher pH values are basic.
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