Citric acid (CA), molecular formula C 7H. O₇, is an important organic acid. It is a colorless crystal, odourless, has a strong acidic taste, is soluble in water, and is a natural preservative and food additive.
Citric acid is soluble in water with a solubility of 59% at 20 ° C and a pH of 2.1 in 2% aqueous solution. The morphology of citric acid is different due to different crystallization conditions. It has weathering property in dry air and hygroscopicity in wet air. It can be decompose into a variety of products by heating, and can react with acid, alkali, glycerol, etc.
Citric acid---Food industry; Metal cleaning; Fine chemical; Concrete.
