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Merck
CN

33506

Oxalic acid dihydrate

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

Synonym(s):

Ethanedioic acid dihydrate

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About This Item

Linear Formula:
HO2CCO2H · 2H2O
CAS Number:
6153-56-6
Molecular Weight:
126.07
NACRES:
NA.21
PubChem Substance ID:
57648855
eCl@ss:
39021701
UNSPSC Code:
12352100
EC Number:
205-634-3
MDL number:
MFCD00149102
Beilstein/REAXYS Number:
3679436

Key Documents

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Product Name

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

InChI key

GEVPUGOOGXGPIO-UHFFFAOYSA-N

InChI

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

SMILES string

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

grade

ACS reagent
puriss. p.a.

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)

functional group

carboxylic acid

Quality Level

200

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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.

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.

pictograms

CorrosionExclamation mark
GHS05,GHS07

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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Certificates of Analysis (COA)

Lot/Batch Number
BCCP0086
BCCL4245
BCCM4256
BCCK9057
BCCK9056

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Griffin RG, et al.
J. Chem. Phys. , 63(3), 1267-1271 (1975)
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