• A chemical which has any of the following characteristics: increases the proportion of hydrogen ions in a solution, gives up a proton in solution, has at least one hydrogen that can be replaced by metals or basic radicals, that can react with a base to form a salt, or that accepts two electrons. According to the pH scale, an acid has a reading of less than 7.0, while a base (6) has a value above 7.0. The lower the reading, the stronger the acid.

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