Citric Acid Anhydrous(C6H8O7) is the most widely distributed organic acid in fruits and vegetables, and also the most widely used acid agent in food. Anhydrous citric acid is an important organic acid, also known as citric acid, colorless crystal, often containing a molecule of crystalline water, odorless, has a strong sour taste, easy to dissolve in water.Its calcium salt is more soluble in cold water than in hot water, and this property is often used to identify and separate citric acid. Citric Acid Anhydrous can be obtained by controlling appropriate temperature during crystallization.