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Home > Products > Additives > Anhydrous Citric Acid

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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FAQ

Q1：Does it support customized products?

A1：Yes, it does. Formulations can be adjusted and customized production can be carried out according to customer's industry needs and performance parameters.

Q2：Can samples be provided?

A2：We support free sample delivery and testing services to meet customers' early testing needs.

Q3：Is the product quality stable?

A3：With full-process quality inspection and control, there are minimal batch differences, and the purity and stability strictly meet the standards.

Q4：What is the shipping cycle?

A4：For regular inventory, we offer quick delivery. For customized orders, we arrange production according to demand and ensure timely delivery.

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