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Anhydrous Citric Acid

Name: Anhydrous Citric Acid
SKU: 0

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

Property	Value
Melting Point	153-159 °C (lit.)
Boiling Point	310 °C (decomp)
Bulk Density	560 kg/m³
Density	1.67 g/cm³ at 20 °C
Vapor Pressure (vs air)	7.26 (vs air)
Vapor Pressure	<0.1 hPa (20 °C)
Refractive Index	1.493~1.509
FEMA	2306/CITRIC ACID
Flash Point	100 °C
Storage Conditions	2-8°C
Solubility	At 15°C, citric acid is also soluble in anhydrous (absolute) ethanol (76 parts citric acid per 100 parts ethanol).
Form	White powder
Acid Dissociation Constant (pKa)	3.14 (at 20°C)
Color	White
Odor	Odorless
pH Value	3.24 (1 mM solution); 2.62 (10 mM solution); 2.08 (100 mM solution)
Explosive Limit	8%, 65°F
Toxicity	Odorless
Biological Source	Synthetic
Water Solubility	Soluble 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
Sensitivity	Hygroscopic
Merck	14,2326
JECFA Number	218
BRN	782061
Henry's Law Constant	3.1×10¹⁵ mol/(m³Pa) at 25°C, Burkholder et al. (2019)
Stability	Stable. Incompatible with bases, strong oxidizing agents, reducing agents, metal oxides.
Cosmetic Ingredient Functions	CHELATING, FRAGRANCE, BUFFERING
Cosmetic Ingredient Assessment	Citric acid (77-92-9)
InChI	1S/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)
InChIKey	KRKNYBCHXYNGOX-UHFFFAOYSA-N
SMILES	OC(=O)CC(O)(CC(O)=O)C(O)=O
LogP	-1.64
CAS Database	77-92-9 (CAS DataBase Reference)
NIST Chemical Substances Information	1,2,3-Propanetricarboxylic acid, 2-hydroxy- (77-92-9)
EPA Chemical Substances Information	Citric acid (77-92-9)

Safety Information

Property	Value
Hazard Symbols	Xi, C, T
Hazard Class Codes	41-36/37/38-36/38-37/38-34-36-35-61-60
Safety Description Codes	26-39-37/39-24/25-36/37/39-45-36-53
UN Transport Number	UN 1789 8/PG 3
WGK Germany	1
RTECS Number	GE7350000
F	9
TSCA	TSCA listed
HS Code	2918 14 00
Storage Class	11 - Combustible solids
Hazard Class	Eye Irritant Category 2 Specific Target Organ Toxicity - Single Exposure, Category 3
Hazardous Substances Data	77-92-9 (Hazardous Substances Data)
Toxicity	LD50 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 .

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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.
We only provide highest quality goods available, accompanied by after support!

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FAQ

Q1: What international standards do your products and services comply with?

A1: Our products fully comply with international standards such as REACH, MSDS, and COA, and we strictly implement the ISO9001 quality management system. We can also provide third-party testing reports (SGS, BV, etc.) according to customer needs.

Q2: How long does it take for goods to be delivered to my country?
A2: The delivery time depends on the transport mode and destination country. Generally, sea transport takes 15-30 days, air transport takes 3-7 days, and we will optimize the transport route to shorten the delivery time as much as possible.

Can you provide customs clearance services for dangerous chemicals?
A3: Yes. Our team is proficient in the customs clearance procedures for dangerous chemicals in various countries, and can provide professional compliant declaration and customs clearance services to ensure smooth customs clearance.

Q4: Do you provide customized product and service solutions?
A4: Yes. We can provide personalized product customization and export service solutions according to your specific needs (product specifications, application scenarios, procurement volume, etc.).

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