Acid.

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A sour substance, one which liberates hydrogen ions in water and is sour and corrosive; will turn litmus red and has a pH of less than 7; acids are generally divided into two classes. (1) strong mineral or inorganic acids such as sulfamic, sulfuric, phosphoric, hydrochloric, or nitric, (2) weak organic or natural acids such as acetic (vinegar), citric (citrus fruit juices), oxalic, and fatty acids (oleic) such as palmitic and stearic.

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