There is no substantial difference between citric acid monohydrate and citric acid anhydrous, except that the former contains crystal water. After being dissolved, the crystal water is no different from ordinary water.

Both can be used in food. No matter which one is used, it must be food grade and meet the food safety level, and the packaging must be clearly marked with food additives.

Extended information:

1. Citric acid monohydrate

Molecular formula: C6H8O7·H2O.

Molecular weight: 210.14.

Properties: Density 1.54. Melting point 135-152℃. Flash point 173.9℃. Water solubility 1630 g/L (20℃).

Mainly used in the food and beverage industries as sour agents, flavoring agents, preservatives, and preservatives. It is also used as antioxidant, plasticizer, detergent, etc. in the chemical industry, cosmetics industry and washing industry.

2. Anhydrous citric acid

Chinese name 2: 2-hydroxypropane-1,2,3-tricarboxylic acid.

Molecular formula: C6H8O7.

Molecular weight: 192.14.

Physical and chemical properties

Appearance and properties: White crystalline powder, odorless.

Melting point (℃): 153. Boiling point (℃): (decomposition). Relative density (water=1): 1.6650. Flash point (℃): 100. Ignition temperature (℃): 1010 (powder). Explosion upper limit% (V/V): 8.0 (65℃). Solubility: Soluble in water, ethanol, ether, insoluble in benzene, slightly soluble in chloroform.

Reference link: Baidu Encyclopedia - Citric Acid Monohydrate Baidu Encyclopedia - Citric Acid Anhydrous