Food Additive Citric Acid Monohydrate CAS NO.77-92-9

CITRIC ACID MONOHYDRATE

Properties:

At room temperature, citric acid is a white crystalline powder. It can exist either in an anhydrous (water-free) form or as a monohydrate. The anhydrous form crystallizes from hot water, whereas the monohydrate forms when citric acid is crystallized from cold water. The monohydrate can be converted to the anhydrous form by heating it above 74 c. Citric acid also dissolves in absolute (anhydrous) ethanol (76 parts of citric acid per 100 parts of ethanol) at 15 degrees celsius. In chemical structure, citric acid shares the properties of other carboxylic acids. When heated above 175 c, it decomposes through the loss of carbon dioxide and water.
 

Description:

Colorless or white crystalline powder

General characteristic:

Molecular Formula: C₆H₈O₇ · H₂O  

Molecular Weight: 210.14

Specification:
Characters: A white, crystalline powder, colorless crystals or granules
Identification: To pass test
Appearance of solution: To pass test
Readily carbonisale substances: To pass test
Oxalic acid: Max. 350 ppm
Aluminium: Max. 0.2 ppm
Sulphates: Max. 150 ppm
Heavy metals: Max. 10 ppm
Water: 7.5%~9.0%
Sulphated ash: Max. 0.1%
Bacterial endotoxins: To pass test
Assay: 99.0%~100.5%

Storage:

Kept in a light-proof, well-closed, dry and cool place.

Standard specifications:

BP93, BP98, USP2003, USP24, USP26, E330