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　　The molecular formula of citric acid monohydrate is C6H8O7 · H2O, which is mainly used in the food and beverage industry as a sour agent, flavoring agent, preservative and preservative. It is also used as antioxidant, plasticizer and detergent in chemical industry, cosmetics industry and washing industry. Powder and air can form explosive mixtures. In case of fire, high heat or contact with oxidants, there is a danger of burning and explosion. Citric acid monohydrate and sodium citrate dihydrate are mixed with ph6.0 citrate buffer.

　　Anhydrous citric acid, molecular formula C6H8O7, is colorless and translucent crystal or white particles or white crystalline powder, odorless, very acidic, soluble in water, alcohol and ether. Anhydrous citric acid can be obtained by controlling the appropriate temperature during crystallization. The aqueous solution is acidic. It is slightly weathered in dry air and deliquescent in humid air. Mainly used in the food and beverage industry as sour agents, acidity regulators, flavoring agents and preservatives, preservatives. It is also used as antioxidant, plasticizer and detergent in chemical industry, cosmetics industry and washing industry.