Oxalic acid dihydrate technical (C2H204 x 2H2O)

Oxalic acid

IUPAC name

ethanedioic acid

Other names

oxalic acid

Identifiers

CAS number

144-62-7 

PubChem

971

ChemSpider

946 

UNII

9E7R5L6H31 

EC number

205-634-3

UN number

3261

DrugBank

DB03902

MeSH

Oxalic+acid

ChEBI

CHEBI:16995 

ChEMBL

CHEMBL146755 

RTECS number

RO2450000

ATCvet code

QP53AG03

Beilstein Reference

385686

Gmelin Reference

2208

3DMet

B00059

Properties

Molecular formula

C₂H₂O₄

Molar mass

90.03 g mol⁻¹
(anhydrous)
126.07 g mol⁻¹ (dihydrate)

Appearance

White crystals

Density

1.90 g cm⁻³ (anhydrous)
1.653g cm⁻³ (dihydrate)

Melting point

102 to 103 °C (216 to 217 °F; 375 to 376 K) 101.5 °C (214.7 °F) dihydrate

Solubility in water

14.3 g/100ml (25 °C)

Solubility

23.7 g/100ml (15 °C) in ethanol

1.4 g/100ml (15 °C) in diethyl ether

Acidity (pK_a)

1.25, 4.14

Hazards

Main hazards

Toxic

Flash point

166 °C (331 °F; 439 K)

Related compounds

Related compounds

oxalyl chloride
disodium oxalate
calcium oxalate
phenyl oxalate ester

Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)