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acid:

A substance that produces hydrogen ions (H+) when dissolved in water. Acids turn a specially treated paper called litmus from blue to red. A strong acid, such as sulfuric or nitric acid, can burn the skin and can eat away the strongest metals. Other acids, such as citric acid in oranges and lemons and acetic acid in vinegar are harmless. Still others, such as ascorbic acid (vitamin C), are used by the body