Citric acid Mono Hydrate

Cas Number


Other Names

Citric acid

The formula



Citric acid is a weak organic tricarboxylic acid having the chemical formula C6H8O7. It occurs naturally in citrus fruits. The anhydrous form crystallizes from hot water, while the monohydrate forms when citric acid is crystallized from cold water

Physical and Chemical Properties
Molar mass 192.12 g·mol−1
Appearance crystalline white solid
Odor odorless
Density 1.665 g/cm3 (anhydrous)
1.542 g/cm3 (18 °C, monohydrate)
Melting point 156 °C (313 °F; 429 K)
Boiling point 310 °C (590 °F; 583 K) decomposes from 175 °C[1]
Solubility in water 117.43 g/100 mL (10 °C), 147.76 g/100 mL (20 °C), 180.89 g/100 mL (30 °C), 220.19 g/100 mL (40 °C), 382.48 g/100 mL (80 °C), 547.79 g/100 mL (100 °C)[2]
Solubility soluble in alcohol, ether, ethyl acetate, DMSO, insoluble in C, 6H, 6, CHCl3, CS2, toluene[1]
Solubility in ethanol 62 g/100 g (25 °C)[1]
Solubility in amyl acetate 4.41 g/100 g (25 °C)[1]
Solubility in diethyl ether 1.05 g/100 g (25 °C)[1]
Solubility in 1,4-Dioxane 35.9 g/100 g (25 °C)[1]
log P −1.64
Acidity (pKa) pKa1 = 3.13[3], pKa2 = 4.76[3], pKa3 = 6.39,[4] 6.40[5]
Refractive index (nD) 1.493–1.509 (20 °C)[2], 1.46 (150 °C)[1]
Viscosity 6.5 cP (50% aq. sol.)[2]

1. In Food Citric Acid Monohydrate is widely used as organic acid and pH-control agent, flavoring and preservative in food production in candy, cookies, biscuits, canned fruits, jams, and jellies, Baby Food, Infant Formula, Bakery, Cereals, Snacks, Confectionery, Dairy, Desserts, Ice Cream, Meat, Seafood, Ready Meals, Instant Food, Sauces, Dressings, Seasonings.

2. In Beverage Citric Acid Monohydrate can be used as acidity regulator and antioxidant in beverage such as in Alcoholic Beverages, Carbonated Soft Drinks, Instant Drinks, Syrups, Juice Drinks, RTD Tea and Coffee, Sports and Energy Drinks, Waters.

3. In Pharmaceutical Citric Acid Monohydrate can be used as thrombin inhibitor and fungicide in Pharmaceutical.

4. In Health and Personal care Citric Acid is used in cosmetics and personal care products as a preservative and to adjust the ph balance. Citric acid is also one of a group of ingredients known as alpha hydroxy acids that are used as the active ingredients in chemical skin peels. citric acid was used in almost every category of cosmetic product with over 10,000 reported uses. Citric Acid can be used in baby products, make-up, lipstick, bath products, soaps and detergents, hair dyes and colors, and hair and skin care products.

5.In Agriculture/Animal Feed/Poultry Citric Acid Monohydrate can be used as antioxidant and ph regulator in Agriculture/Animal Feed/Poultry feed such as in broiler feed, chicken feed.

6.In Other Industries Citric Acid Monohydrate is widely used as cleansing agent, surfactant in various other industries. As cleansing agent: in plumbing cleaning to remove scale. As anti crease agent: in textile to prevent formaldehyde contamination. As additive: in plastic manufacturing to improve mechanical properties. As concrete retardant: in construction to improve concrete quality.