Ammonium oxalate

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Ammonium oxalate
IUPAC name
Diammonium ethanedioate
Molar mass 124.10 g/mol
Appearance White crystalline solid
Odor Odorless
Density 1.5 g/cm3 (at 20 °C)
Melting point 133 °C (271 °F; 406 K) (decomposition observed at 70 °C)
Boiling point Decomposes
4.5 g/100 ml (at 20 ºC)[1]
Solubility Insoluble in benzene, carbon tetrachloride
Safety data sheet DoGee
Related compounds
Related compounds
Oxalic acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Ammonium oxalate, also known as diammonium ethanedioate is a chemical compound, with the chemical formula (NH4)2C2O4. It can sometimes be encountered in nature, in guano.



Ammonium oxalate will decompose when heated, to yield oxamide:

(NH4)2C2O4 → (CONH2)2 + 2 H2O

Further heating will give off carbon monoxide, dioxide, water and cyanide.


Ammonium oxalate is a white crystalline solid, soluble in water. It is generally encountered as a monohydrate. Ammonium oxalate has a density of 1.5 g/cm3 at 20 °C.[3]


Ammonium oxalate is sold by many chemical suppliers. Can also be bought online.


Ammonium oxalate can be obtained by reacting ammonium carbonate, bicarbonate or aqueous ammonia with oxalic acid.

Another route involves the hydrolysis of cyanogen, in a neutral or slightly acidic aqueous environment.

Heating a mixture of anhydrous oxalic acid and urea between 150 - 160°C will yield ammonium oxalate, as well as oxamide and carbon dioxide.[4]


  • Make oxamide



Ammonium oxalate is harmful if ingested.


In closed bottles, away from acidic vapors.


Ammonium oxalate can be destroyed by reacting it with a base, followed by pyrolysis.


  1. Hill; Distler; Journal of the American Chemical Society; vol. 57; (1935); p. 2203
  2. Crenshaw, J. L.; Ritter, I.; Zeitschrift fuer Physikalische Chemie, Abteilung B: Chemie der Elementarprozesse, Aufbau der Materie; vol. 16; (1932); p. 147
  3. Alyaev; Belousov; Bukin; Efimova; Kuz'micheva; Rapoport; Roudenko; Chaban; Russian Journal of Inorganic Chemistry; vol. 47; nb. 3; (2002); p. 398 - 406
  4. Das-Gupta, J. M.; Journal of the Indian Chemical Society; vol. 10; (1933); p. 117 - 123

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