Biology / Bio 0159 · Atom · ~20 seconds
Bases
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A base is a substance that decreases the concentration of hydrogen ions in a solution, raising its pH.
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Adding baking soda to water lowers the free hydrogen ion concentration in the mixture and raises its pH above 7.
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Students often assume a base must contain hydroxide or taste bitter; a base only needs to lower hydrogen ion concentration, not add hydroxide directly.