Ammonium oxalate

Ammonium oxalate is a chemical compound with the chemical formula [NH₄]₂C₂O₄. Its formula is often written as (NH₄)₂C₂O₄ or (COONH₄)₂. It is an ammonium salt of oxalic acid. It consists of ammonium cations ([NH₄]⁺) and oxalate anions (C₂O2−4). The structure of ammonium oxalate is ([NH₄]⁺)₂[C₂O₄]²⁻. Ammonium oxalate sometimes comes as a monohydrate ([NH₄]₂C₂O₄·H₂O). It is a colorless or white salt under standard conditions and is odorless and non-volatile. It occurs in many plants and vegetables.

Ammonium oxalate

Names
IUPAC name Ammonium oxalate
Systematic IUPAC name Ammonium ethanedioate
Other names Diammonium oxalate
Identifiers
CAS Number	1113-38-8 Y 6009-70-7 (monohydrate) Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:91241 N
ChemSpider	13577 Y
ECHA InfoCard	100.012.912
PubChem CID	14213
UNII	0PB8MO5U0H Y L4MP14OB48 (monohydrate) Y
CompTox Dashboard (EPA)	DTXSID50889443
InChI InChI=1S/C2H2O4.2H3N/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H3 Y Key: VBIXEXWLHSRNKB-UHFFFAOYSA-N Y InChI=1S/C2H2O4.2H3N/c3-1(4)2(5)6;;/h(H,3,4)(H,5,6);2*1H3
SMILES [O-]C(=O)C([O-])=O.[NH4+].[NH4+]
Properties
Chemical formula	[NH4]2C2O4
Molar mass	124.096 g·mol−1
Appearance	Colorless or white crystalline solid
Density	1.5 g/cm3[1]
Melting point	70 C (158 F, 343.15 K)
Solubility in water	5.20 g/(100 ml) (25 °C)[1]
Hazards
GHS labelling:
Hazard statements	H302, H312, H319
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Vertebrate

It is produced in the body of vertebrates by metabolism of glyoxylic acid or ascorbic acid. It is not metabolized but excreted in the urine.^[2] It is a constituent of some types of kidney stone.^[3][4] It is also found in guano.

Mineralogy

Oxammite is a natural mineral form of ammonium oxalate. This mineral is extremely rare. It is an organic mineral derived from guano.^[5]

Chemistry

Ammonium oxalate is used as an analytical reagent and general reducing agent.^[2] It and other oxalates are used as anticoagulants, to preserve blood outside the body.^{[citation needed]}

Earth sciences

Acid ammonium oxalate (ammonium oxalate acidified to pH 3 with oxalic acid) is commonly employed in soil chemical analysis to extract iron and aluminium from poorly-crystalline minerals (such as ferrihydrite), iron(II)-bearing minerals (such as magnetite) and organic matter.^{[6][page needed]}