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33506

Sigma-Aldrich

Oxalic acid dihydrate

puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.5% (manganometric)

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Synonym(s):
Ethanedioic acid dihydrate
Linear Formula:
HO2CCO2H · 2H2O
CAS Number:
Molecular Weight:
126.07
Beilstein:
3679436
EC Number:
MDL number:
eCl@ss:
39021701
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent
puriss. p.a.

Quality Level

Agency

USP/NF
reag. ISO
reag. Ph. Eur.

vapor density

4.4 (vs air)

vapor pressure

<0.01 mmHg ( 20 °C)

Assay

≥99.5% (manganometric)

form

crystals

impurities

foreign organic matter, in accordance
≤0.001% total nitrogen (N)

ign. residue

≤0.01% (as SO4)

mp

104-106 °C (lit.)

anion traces

chloride (Cl-): ≤5 mg/kg
sulfate (SO42-): ≤20 mg/kg

cation traces

Ca: ≤5 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤2 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg
heavy metals: ≤5 ppm (by ICP-OES)

SMILES string

[H]O[H].[H]O[H].OC(=O)C(O)=O

InChI

1S/C2H2O4.2H2O/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H2

InChI key

GEVPUGOOGXGPIO-UHFFFAOYSA-N

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This Item
756998.182421.93018
Oxalic acid dihydrate puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., &#8805;99.5% (manganometric)

Sigma-Aldrich

33506

Oxalic acid dihydrate

-
Oxalic acid dihydrate BioUltra, &#8805;99.0% (RT)

Sigma-Aldrich

75699

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Premium Grade
Oxalic acid dihydrate for synthesis

Sigma-Aldrich

8.18242

Oxalic acid dihydrate

-
Supelco

Supelco

1.93018

Oxalic acid dihydrate

-
agency

USP/NF, reag. ISO, reag. Ph. Eur.

agency

-

agency

-

agency

-

vapor density

4.4 (vs air)

vapor density

4.4 (vs air)

vapor density

-

vapor density

-

vapor pressure

<0.01 mmHg ( 20 °C)

vapor pressure

<0.01 mmHg ( 20 °C)

vapor pressure

0.000312 hPa ( 25 °C)

vapor pressure

-

assay

≥99.5% (manganometric)

assay

≥99.0% (RT)

assay

≥99% (manganometric)

assay

-

form

crystals

form

crystals

form

solid

form

-

General description

Oxalic acid dihydrate crystals are monoclinic and exhibit a space group P21/n. Each unit cell contains two molecules. 13C chemical shielding tensors in oxalic acid dihydrate have been evaluated.

Application

Oxalic acid dihydrate has been used to prepare oxalate precursor, which was employed for the synthesis of zinc oxide nanopowders. It may be used to prepare the 0.01M solution of oxalic acid, which was employed in the mobile phase in liquid chromatographic studies.

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Hazard Classifications

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

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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13C chemical shielding in oxalic acid, oxalic acid dihydrate, and diammonium oxalate.
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J. Chem. Phys. , 63(3), 1267-1271 (1975)
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