Summary
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.
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| IUPAC name
Ammonium oxalate
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| Systematic IUPAC name
Ammonium ethanedioate | |
| Other names
Diammonium oxalate
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3D model (JSmol)
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| ECHA InfoCard | 100.012.912 |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| [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) |
| 5.20 g/(100 ml) (25 °C)[1] | |
| Hazards | |
| GHS labelling: | |
| H302, H312, H319 | |
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
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Vertebrate edit
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 edit
Oxammite is a natural mineral form of ammonium oxalate. This mineral is extremely rare. It is an organic mineral derived from guano.[5]
Chemistry edit
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 edit
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]
References edit
- ^ a b John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99th ed.). CRC Press. pp. 4–41. ISBN 978-1138561632.
- ^ a b National Center for Biotechnology Information. PubChem Compound Database; CID 14213 (accessed 15 November 2016).
- ^ The International Pharmacopoeia, p.1292, Volume 1, World Health Organization, 2006 ISBN 92-4-156301-X.
- ^ N G Coley, "The collateral sciences in the work of Golding Bird (1814-1854)", Medical History, iss.4, vol.13, October 1969, pp.372.
- ^ "Home". mindat.org.
- ^ Rayment, George; Lyons, David (2011). Soil Chemical Methods - Australasia. CSIRO Publishing. ISBN 9780643101364.