Citric acid

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Citric acid
Identifiers
CAS number 77-92-9 YesY
PubChem 311
ChemSpider 305 YesY
UNII XF417D3PSL YesY
EC nummer 201-069-1
DrugBank DB04272
KEGG D00037 YesY
ChEBI CHEBI:30769 YesY
ChEMBL CHEMBL1261 YesY
RTECS nummer GE7350000
ATC code A09AB04
Jmol-3D images Image 1
Properties
Molecular formula C6H8O7
Molar mass 192.124 g/mol (anhydrous)
210.14 g/mol (monohydrate)
Appearance crystalline white solid
Odor odorless
Density 1.665 g/cm3(1.5g/cm3 for monohydrate)
Meltin pynt

156 °C, 429 K, 313 °F

Boilin pynt

310 °C, 583 K, 590 °F (decomposes)

Solubility in water 59[2] g/100 ml (20 °C)
Solubility very soluble in ethanol
soluble in ether, ethyl acetate
insoluble in benzene, chloroform
log P -1.64
Acidity (pKa) pKa1 = 3.14
pKa2 = 4.75
pKa3 = 6.39,[3] 6.40[4]
Thermochemistry
Std enthalpy o
formation
ΔfHo298
-1548.8 kJ/mol
Hazards
MSDS HMDB
Main hazards skin an eye irritant
NFPA 704
NFPA 704.svg
1
2
0
Flash pynt 155 °C (311 °F)
Autoigneetion
temperatur
345 °C (653 °F)
Explosive leemits 1.8-4.8%
LD50 3000 mg/kg (rat, oral)
Related compounds
Relatit compoonds sodium citrate, calcium citrate
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Citric acid is a weak organic acid wi the formula C6H8O7. It is a naitural preservative/conservative an is an aa uised tae add an acidic or sour taste tae fuids an drinks. In biochemistry, the conjugate base o citric acid, citrate, is important as an intermediate in the citric acid cycle, which occurs in the metabolism o aw aerobic organisms.

Citric acid is a commodity chemical, an mair nor a million tonnes are produced every year bi fermentation. It is uised mainly as an acidifier, as a flavorin, an as a chelatin agent.

References[eedit | eedit soorce]

  1. David R. Lide, ed. (2005). "Physical Constants of Organic Compounds". CRC Handbook of Chemistry and Physics (Internet Version ed.). Boca Raton, FL: CRC Press. 
  2. http://anderquim.com/Genericos/Genericos/Acido%20Citrico%20Anhidro_FDS.pdf
  3. "Data for Biochemical Research". ZirChrom Separations, Inc. Retrieved January 11, 2012. 
  4. "Ionization Constants of Organic Acids". Michigan State University. Retrieved January 11, 2012.