Ammonium oxalate

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Ammonium oxalate
Ammonium oxalate.svg
IUPAC name
Diammonium ethanedioate
Other names
Diammonium oxalate
3D model (JSmol)
ECHA InfoCard 100.012.912
Molar mass 124.096 g·mol−1
Appearance White solid
Melting point 70 C (158 F, 343.15 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Ammonium oxalate, C2H8N2O4 – more commonly written as (NH4)2C2O4 – is an oxalate salt with ammonium (sometimes as a monohydrate). It is a colorless (white) salt under standard conditions and is odorless and non-volatile. It is the ammonium salt of oxalic acid, and occurs in many plants and vegetables.


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.[1] It is a constituent of some types of kidney stone.[2][3] It is also found in guano.


Oxammite is a natural, mineral form of ammonium oxalate. This mineral is extremely rare.[4]


Ammonium oxalate is used as an analytical reagent and general reducing agent.[1] It and other oxalates are used as anticoagulants, to preserve blood outside the body.

Earth Sciences[edit]

Acid ammonium oxalate (i.e. ammonium oxalate acidified to pH 3 with oxalic acid) is commonly employed in soil chemical analysis to extract Fe and Al from poorly-crystalline minerals (e.g. ferrihydrite), Fe(II)-bearing minerals (e.g. magnetite) and organic matter[5].


  1. ^ a b National Center for Biotechnology Information. PubChem Compound Database; CID 14213 (accessed 15 November 2016).
  2. ^ The International Pharmacopoeia, p.1292, Volume 1, World Health Organization, 2006 ISBN 92-4-156301-X.
  3. ^ N G Coley, "The collateral sciences in the work of Golding Bird (1814-1854)", Medical History, iss.4, vol.13, October 1969, pp.372.
  4. ^
  5. ^ Rayment, George; Lyons, David (2011). Soil Chemical Methods - Australasia. CSIRO Publishing. ISBN 9780643101364.