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  • 221716
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221716

Sigma-Aldrich

Ammonium oxalate monohydrate

ACS reagent, ≥99%

Synonym(s):
Oxalic acid diammonium salt
Linear Formula:
(NH4)2C2O4 · H2O
CAS Number:
Molecular Weight:
142.11
Beilstein:
3759830
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NB.24

grade

ACS reagent

Quality Level

vapor pressure

<0.1 hPa ( 20 °C)

Assay

≥99%
99.0-101.0% (ACS specification)

form

crystalline powder
crystals or granules

impurities

≤0.005% insolubles

ign. residue

≤0.02%

pH

6-7 (25 °C, 14.2 g/L)

mp

133 °C (dec.) (lit.)

anion traces

chloride (Cl-): ≤0.002%
sulfate (SO42-): ≤0.002%

cation traces

Fe: ≤2 ppm
heavy metals: ≤5 ppm (by ICP)

SMILES string

OC(C(O)=O)=O.N.O.N

InChI

1S/C2H2O4.2H3N.H2O/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);2*1H3;1H2

InChI key

MSMNVXKYCPHLLN-UHFFFAOYSA-N

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3797430989832304
grade

ACS reagent

grade

-

grade

-

grade

ACS reagent, puriss. p.a.

vapor pressure

<0.1 hPa ( 20 °C)

vapor pressure

-

vapor pressure

-

vapor pressure

<0.1 hPa ( 20 °C)

assay

≥99%, 99.0-101.0% (ACS specification)

assay

≥99.99% trace metals basis

assay

≥99.5% (RT)

assay

99.5-101.0%

form

crystalline powder, crystals or granules

form

powder

form

-

form

crystalline

impurities

≤0.005% insolubles

impurities

≤100.0 ppm Trace Metal Analysis

impurities

insoluble matter, passes filter test

impurities

≤0.005% in water insoluble matters

pH

6-7 (25 °C, 14.2 g/L)

pH

-

pH

6.0-7.0 (25 °C, 0.1 M in H2O)

pH

6-7 (20 °C, 2.5%)

General description

Ammonium oxalate monohydrate is a diammonium salt of oxalic acid. Its refined crystal structure has been investigated by three-dimensional diffraction studies. Influence of bivalent [Mn(II), Co(II), Ni(II)] and trivalent cations [Fe(III), Cr(III)] impurities on the growth rates of ammonium oxalate monohydrate crystals has been described. Its space group and unit cell parameters have been analyzed by neutron diffraction studies. Its IR spectra have been compared with that of isolated coal-solubilizing agent (CSA).

Application

Ammonium oxalate monohydrate may be used in the preparation of tetramethylammonium oxalate.

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Irrit. 2

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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