Cas no 77-92-9 Basic Organic Raw Materials Citric acid for organic acid Hot Sales Anhydrous Citric Acid for Food/Cosmetic Medical Usage CAS No 77-92-9

Citric acid info:

Names
IUPAC name Citric acid
Preferred IUPAC name 2-Hydroxypropane-1,2,3-tricarboxylic acid
Identifiers
CAS Number	77-92-9
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30769
ChEMBL	ChEMBL1261
ChemSpider	305
DrugBank	DB04272
ECHA InfoCard	100.000.973
EC Number	201-069-1
E number	E330 (antioxidants, ...)
IUPHAR/BPS	2478
KEGG	D00037
PubChem CID	311 22230 (monohydrate)
RTECS number	GE7350000
CompTox Dashboard (EPA)	DTXSID3020332
Properties
Chemical formula	C6H8O7
Molar mass	192.123 g/mol (anhydrous), 210.14 g/mol (monohydrate)[2]
Appearance	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[3]
Solubility in water	54% w/w (10 °C) 59.2% w/w (20 °C) 64.3% w/w (30 °C) 68.6% w/w (40 °C) 70.9% w/w (50 °C) 73.5% w/w (60 °C) 76.2% w/w (70 °C) 78.8% w/w (80 °C) 81.4% w/w (90 °C) 84% w/w (100 °C)[4]
Solubility	Soluble in acetone, alcohol, ether, ethyl acetate, DMSO Insoluble in C 6H 6, CHCl3, CS2, toluene[3]
Solubility in ethanol	62 g/100 g (25 °C)[3]
Solubility in amyl acetate	4.41 g/100 g (25 °C)[3]
Solubility in diethyl ether	1.05 g/100 g (25 °C)[3]
Solubility in 1,4-dioxane	35.9 g/100 g (25 °C)[3]
log P	−1.64
Acidity (pKa)	pKa1 = 3.13[5] pKa2 = 4.76[5] pKa3 = 6.39,[6] 6.40[7]
Refractive index (nD)	1.493–1.509 (20 °C)[4] 1.46 (150 °C)[3]
Viscosity	6.5 cP (50% aq. sol.)[4]
Structure
Crystal structure	Monoclinic
Thermochemistry
Heat capacity (C)	226.51 J/(mol·K) (26.85 °C)
Std molar entropy (S⦵298)	252.1 J/(mol·K)
Std enthalpy of formation (ΔfH⦵298)	−1543.8 kJ/mol
Heat of combustion, higher value (HHV)	1985.3 kJ/mol (474.5 kcal/mol, 2.47 kcal/g), 1960.6 kJ/mol 1972.34 kJ/mol (471.4 kcal/mol, 2.24 kcal/g) (monohydrate)
Pharmacology
ATC code	A09AB04 (WHO)
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Skin and eye irritant
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H290, H319, H315
Precautionary statements	P305+P351+P338
NFPA 704 (fire diamond)	2 1 0
Flash point	155 °C (311 °F; 428 K)
Autoignition temperature	345 °C (653 °F; 618 K)
Explosive limits	8%[5]
Lethal dose or concentration (LD, LC):
LD50 (median dose)	3000 mg/kg (rats, oral)

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