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Merck
CN

75688

Oxalic acid

anhydrous grade, ≥99.0% (RT), crystals, puriss. p.a.

Synonym(s):

Ethanedioic acid

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About This Item

Linear Formula:
HO2CCO2H
CAS Number:
Molecular Weight:
90.03
NACRES:
NA.21
PubChem Substance ID:
UNSPSC Code:
12352100
EC Number:
205-634-3
MDL number:
Beilstein/REAXYS Number:
385686
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Product Name

Oxalic acid, puriss. p.a., anhydrous, ≥99.0% (RT)

InChI key

MUBZPKHOEPUJKR-UHFFFAOYSA-N

InChI

1S/C2H2O4/c3-1(4)2(5)6/h(H,3,4)(H,5,6)

SMILES string

OC(=O)C(O)=O

grade

anhydrous
puriss. p.a.

vapor density

4.4 (vs air)

vapor pressure

<0.01 mmHg ( 20 °C)

assay

≥99.0% (RT)

form

crystals

impurities

≤0.001% total nitrogen (N)
≤1% water

ign. residue

≤0.01% (as SO4)

mp

189.5 °C (dec.) (lit.)

anion traces

chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤350 mg/kg

cation traces

Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤35 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Na: ≤50 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg

functional group

carboxylic acid

Quality Level

Gene Information

human ... SRC(6714)

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Application

Oxalic acid may be used in the preparation of the following:
  • ammonium oxalate
  • calcium oxalate
  • chlorine dioxide (ClO2)
  • potassium hydrogenoxalate

General description

Oxalic acid is a dicarboxylic acid. It reacts with aqueous iron(II) salt solutions to afford iron(III) oxalate.

pictograms

CorrosionExclamation mark

signalword

Danger

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Dam. 1

Storage Class

11 - Combustible Solids

wgk

WGK 1

ppe

dust mask type N95 (US), Eyeshields, Gloves


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