CAS Registry Number: [77-92-9] - Anhydrous
Chemical Formula: C6H8O7
E-Number: E330
CAS Registry Number: [5949-29-1] - Monohydrate
Chemical Formula: C6H8O7.H2O
E-Number: E330
Characteristics
Citric acid anhydrous and monohydrate occur as colourless crystals or a white, crystalline powder. They are odourless substances with a strongly acidic taste. They are slightly deliquescent in moist air, very soluble in water, freely soluble in ethanol (96%) and sparingly soluble in ether.
Citric acid anhydrous and monohydrate are non-toxic and have a low reactivity. They are chemically stable if stored at ambient temperatures. Citric Acid is slightly hygroscopic. In its monohydrate form citric acid is more hygroscopic than in its anhydrous form. The monohydrate is, therefore, more prone to caking than the anhydrous. Citric acid anhydrous and monohydrate are fully biodegradable and can be disposed of with regular waste or sewage according to local legislation.
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