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{{Short description|Simplest dicarboxylic acid}}{{Chembox|Verifiedfields = changed|Watchedfields = changed|verifiedrevid = 476995784|ImageFile = Oxalsäure2.svg|ImageSize = 140|ImageAlt = Structural formula of oxalic acid|ImageFileL1 = Oxalic acid molecule ball from xtal.png|ImageSizeL1 = 120|ImageAltL1 = Skeletal formula of oxalic acid|ImageFileR1 = Oxalic acid molecule spacefill from xtal.png|ImageSizeR1 = 120|ImageAltR1 = Space-filling model of oxalic acid|ImageFile2 = Oxalic acid dihydrate.jpg|ImageName2 = Oxalic acid dihydrate

ROYAL SOCIETY OF CHEMISTRY>THE ROYAL SOCIETY OF CHEMISTRY

LOCATION = CAMBRIDGE

DOI = 10.1039/9781849733069-FP001

CHAPTER = FRONT MATTER, |SystematicName = Ethanedioic acid|OtherNames = Wood bleach(Carboxyl)carboxylic acidCarboxylformic acidDicarboxylic acidDiformic acid|Section1 = {{Chembox Identifiers|CASNo = 144-62-7

correct|CAS}}|CASNo_Comment = (anhydrous)|CASNo1 = 6153-56-6

correct|CAS}}|CASNo1_Comment = (dihydrate)|PubChem = 971|ChemSpiderID = 946

correct|chemspider}}|UNII = 9E7R5L6H31

correct|FDA}}

correct|FDA}}|UNII1 = 0K2L2IJ59O|UNII1_Comment = (dihydrate)|EINECS = 205-634-3|UNNumber = 3261

correct|drugbank}}|DrugBank = DB03902

changed|kegg}}|KEGG = C00209|MeSHName = Oxalic+acid

correct|EBI}}|ChEBI = 16995|RTECS = RO2450000|SMILES = OC(=O)C(=O)O

correct|EBI}}|ChEMBL = 146755

correct|chemspider}}|StdInChI = 1S/C6H6O6/c3-1(4)2(5)6/h(H,3,4)(H,5,6)

correct|chemspider}}|StdInChIKey = MUBZPKHOEPUJKR-UHFFFAOYSA-N|Beilstein = 385686|Gmelin = 2208|3DMet = B00059}}|Section2 = {{Chembox Properties

H2C2O4}}

C=2 | O=4|MolarMass_notes = (anhydrous)126.065 g·mol−1 (dihydrate)|Appearance = White crystals|Odor = Odorless

ZVG=17910}} 1.653 g/cm3 (dihydrate)|MeltingPtC = 189 to 191

101.5

F K}} dihydrate

In g/L:

57.2 (10 °C)

95.5 (20 °C)

139 (30 °C)

217 (40 °C)

315 (50 °C)

426 (60 °C)

YEAR=1987

FIRST1=ALEXANDER

FIRST2=EMANUEL

VOLUME=19

PAGES=317–320,

ethanol 14 g/L (15 Â°C) in diethyl etherRADIANT AGRO CHEM

URL=HTTP://WWW.RACPL.COM/OA_MSDS.HTM

ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20110715144417/HTTP://WWW.RACPL.COM/OA_MSDS.HTM

URL-STATUS=DEAD, |ConjugateBase = Hydrogenoxalate

Ka1 = 1.25pKa2 = 4.14BJERRUM

LAST2=SILLéN

LAST3=SCHWARZENBACH

LAST4=ANDEREGG

TITLE=STABILITY CONSTANTS OF METAL-ION COMPLEXES, WITH SOLUBILITY PRODUCTS OF INORGANIC SUBSTANCES

PUBLISHER=CHEMICAL SOCIETY, London, |VaporPressure =