2021-07-28T07:44:29
E330" redirects here. For the locomotive, see FS Class E330.
For vitamin C, see ascorbic acid.
Citric acid
Zitronensäure - Citric acid.svg
Citric-acid-3D-balls.png
Zitronensäure Kristallzucht.jpg
Names
IUPAC name
Citric acid[1]
Preferred IUPAC name
2-Hydroxypropane-1, 2, 3-tricarboxylic acid[1]
Identifiers
CAS Number
77-92-9 check
3D model (JSmol)
Interactive image
ChEBI
CHEBI:30769 check
ChEMBL
ChEMBL1261 check
ChemSpider
305 check
DrugBank
DB04272 check
ECHA InfoCard 100.000.973 Edit this at Wikidata
EC Number
201-069-1
E number E330 (antioxidants, ...)
IUPHAR/BPS
2478
KEGG
D00037 check
PubChem CID
311
22230 (monohydrate)
RTECS number
GE7350000
UNII
XF417D3PSL check
CompTox Dashboard (EPA)
DTXSID3020332 Edit this at Wikidata
InChI
SMILES
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)[8]
Std molar
entropy (So298) 252.1 J/(mol·K)[8]
Std enthalpy of
formation (ΔfH⦵298) −1543.8 kJ/mol[4]
Heat of combustion, higher value (HHV) 1985.3 kJ/mol (474.5 kcal/mol, 2.47 kcal/g), [4] 1960.6 kJ/mol[8]
1972.34 kJ/mol (471.4 kcal/mol, 2.24 kcal/g) (monohydrate)[4]
Pharmacology
ATC code A09AB04 (WHO)
Hazards
Main hazards Skin and eye corrosion
Safety data sheet HMDB
GHS pictograms GHS05: Corrosive[5]
GHS Signal word Danger
GHS hazard statements H319[5]
GHS precautionary statements P305+351+338[5]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
210
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)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
check verify (what is check☒ ?)
Infobox references
Citric acid is an organic compound with the chemical formula HOC(CO2H)(CH2CO2H)2. Usually encountered as a white solid, it is a weak organic acid. It occurs naturally in citrus fruits. In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms.
More than two million tons of citric acid are manufactured every year. It is used widely as an acidifier, as a flavoring, and a chelating agent.
A citrate is a derivative of citric acid; that is, the salts, esters, and the polyatomic anion found in solution. An example of the former, a salt is trisodium citrate; an ester is triethyl citrate. When part of a salt, the formula of the citrate anion is written as C6H5O3−7 or C3H5O(COO)3−3.
Authorized Dealer Of Shree Vissnu Scientific Company In
Coimbatore, Madurai, Tiruchirappalli,
Tiruppur, Salem, Erode, Thoothukudi, Karur, Tuticorin, Coimbatore, Madurai, Nilgiris, Kancheepuram, Theni, Erode, Thanjavur, , Namakkal, Krishnagiri, Coimbatore, Dindigul,
Tiruppur, Theni, Tirunelveli, Vellore, Thiruvannamalai, OOty Kancheepuram, Cuddalore, Salem, Tiruppur, Cuddalore, Erode, , Erode, Namakkal, Salem, Kancheepuram, Madurai, Namakkal, Perambalur, Nilgiris, Theni, Tuticorin, pondicherry, kanjikode, Palakkad, Hosur, mandiya, Malur, Nanjangodu, hosur sipcot phase-1, phase visit us oue website www.srivishnugroups.in
Have a question? Ask here!
Required fields are marked *