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Citric Acid Chemceed Citric acid is an excellent chelating agent, making it useful in cleaners to remove limescale and to soften water in soaps and detergents. For pharmaceuticals and cosmetics, citric acid is used as a pH adjuster. As a food additive, citric acid is a natura...展开 Citric acid is an excellent chelating agent, making it useful in cleaners to remove limescale and to soften water in soaps and detergents. For pharmaceuticals and cosmetics, citric acid is used as a pH adjuster. As a food additive, citric acid is a natural preservative and is also used to an acidic or sour taste to foods and drinks. 收起