Citric acid monohydrate is a white, water-soluble powder with the chemical formula C6H8O7.H2O, which is found naturally in many fruits and vegetables, especially citrus fruits. citric acid is the only edible acid among all available acid. Citric acid can exist in two forms, anhydrous and aqueous.  It isUsed in food industry (acidity regulator and flavoring in beverages), pharmaceuticals, dyeing industries, oil and metal extraction, cosmetics, in shampoo for cleaning hair and in hair color formulations and.. Citric acid can also be used as a blood acidity regulator.