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Anhydrous Citric Acid

  • Anhydrous Citric Acid
  • Anhydrous Citric Acid
  • Anhydrous Citric Acid

Anhydrous Citric Acid

CAS No.: 77-92-9
Molecular Formula: C6H8O7
Molecular weight: 192.12
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Product Description

Anhydrous Citric Acid, with the chemical formula C₆H₈O₇, is a colorless crystalline solid. It is odorless, has a sour taste, highly soluble in water and ethanol, and is widely used in food, pharmaceutical and cosmetic industries.


Chemical Properties

PropertyValue
Melting Point153-159 °C (lit.)
Boiling Point310 °C (decomp)
Bulk Density560 kg/m³
Density1.67 g/cm³ at 20 °C
Vapor Pressure (vs air)7.26 (vs air)
Vapor Pressure<0.1 hPa (20 °C)
Refractive Index1.493~1.509
FEMA2306/CITRIC ACID
Flash Point100 °C
Storage Conditions2-8°C
SolubilityAt 15°C, citric acid is also soluble in anhydrous (absolute) ethanol (76 parts citric acid per 100 parts ethanol).
FormWhite powder
Acid Dissociation Constant (pKa)3.14 (at 20°C)
ColorWhite
OdorOdorless
pH Value3.24 (1 mM solution); 2.62 (10 mM solution); 2.08 (100 mM solution)
Explosive Limit8%, 65°F
ToxicityOdorless
Biological SourceSynthetic
Water SolubilitySoluble in water (1174 g/L at 10°C, 1809 g/L at 30°C, 3825 g/L at 80°C).
Wavelength Maximum (λ_max)λ: 260 nm Amax: 0.20
λ: 280 nm Amax: 0.10
SensitivityHygroscopic
Merck14,2326
JECFA Number218
BRN782061
Henry's Law Constant3.1×10¹⁵ mol/(m³Pa) at 25°C, Burkholder et al. (2019)
StabilityStable. Incompatible with bases, strong oxidizing agents, reducing agents, metal oxides.
Cosmetic Ingredient FunctionsCHELATING, FRAGRANCE, BUFFERING
Cosmetic Ingredient AssessmentCitric acid (77-92-9)
InChI1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
InChIKeyKRKNYBCHXYNGOX-UHFFFAOYSA-N
SMILESOC(=O)CC(O)(CC(O)=O)C(O)=O
LogP-1.64
CAS Database77-92-9 (CAS DataBase Reference)
NIST Chemical Substances Information1,2,3-Propanetricarboxylic acid, 2-hydroxy- (77-92-9)
EPA Chemical Substances InformationCitric acid (77-92-9)


Safety Information

PropertyValue
Hazard SymbolsXi, C, T
Hazard Class Codes41-36/37/38-36/38-37/38-34-36-35-61-60
Safety Description Codes26-39-37/39-24/25-36/37/39-45-36-53
UN Transport NumberUN 1789 8/PG 3
WGK Germany1
RTECS NumberGE7350000
F9
TSCATSCA listed
HS Code2918 14 00
Storage Class11 - Combustible solids
Hazard ClassEye Irritant Category 2
Specific Target Organ Toxicity - Single Exposure, Category 3
Hazardous Substances Data77-92-9 (Hazardous Substances Data)
ToxicityLD50 in mice, rats (mmol/kg): 5.0, 4.6 i.p. (Gruber, Halbeisen)

Product Usage:
Anhydrous citric acid is the water-free form of citric acid, appearing as a white, crystalline powder with a strong acidic taste. Its lack of water molecules provides enhanced stability and precise moisture control, making it suitable for a wide range of applications :

Food & Beverage Industry: Used as an acidulant, preservative, and flavor enhancer in soft drinks, candies, jams, sauces, and canned foods (E330). It provides tartness, controls pH, inhibits microbial growth, and acts as a chelating agent to prevent discoloration .

Pharmaceuticals & Nutraceuticals: Serves as a pH modifier, effervescent component (reacts with bicarbonates for rapid dissolution), and stabilizer in tablets, syrups, effervescent powders, and vitamin supplements. It also improves taste and enhances solubility .

Cosmetics & Personal Care: Functions as a pH adjuster, exfoliant, and chelating agent in skincare products, shampoos, conditioners, soaps, and bath products. It improves preservative efficacy by binding metal ions .

Household & Industrial Cleaning: Effective descaling agent for removing limescale, rust, and mineral deposits from kettles, coffee makers, dishwashers, and bathroom fixtures. Also used in detergents, metal cleaners, and dishwasher tablets as a biodegradable alternative to harsh acids .

Water Treatment & Technical Applications: Employed as a chelating and pH control agent in water treatment, preventing scaling and corrosion in boilers and cooling towers. Also used in textile processing, electroplating, and chemical synthesis .

Laboratory & Biochemical Research: Used in buffer preparation, as a chelating agent, and in tissue culture systems .

Factory Showcase

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Shipping and Transportation

Delivery Time

Inventory 2-3 working days New manufacturing 7-10 working days

Mode of Transportation
1. By Air, fast but expensive.
2. By Sea, usual and economy.
3. By Train, suit for middle Asia countries.
4. By Express, suit for small package.
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