Biology / Bio 0157 · Atom · ~20 seconds
Acids
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An acid is a substance that increases the concentration of hydrogen ions in a solution, lowering its pH.
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Dissolved carbon dioxide forms carbonic acid in rainwater, increasing its free hydrogen ions and lowering its pH below 7.
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An acid is defined by what it adds to a solution's hydrogen ion concentration, not by how it tastes or what it can dissolve.