Ammonium oxalate

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Ammonium oxalate
Names
IUPAC name
Diammonium ethanedioate
Properties
C2H8N2O4
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
45 g/L (at 20 ºC)[1]
Solubility Insoluble in benzene, carbon tetrachloride
Thermochemistry
Hazards
Safety data sheet DoGee
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.

Properties

Chemical

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.

Physical

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]

Availability

Ammonium oxalate is sold by big chemical suppliers.

Preparation

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]

Projects

  • Make oxamide

Handling

Safety

Ammonium oxalate is harmful if ingested.

Storage

In closed bottles, away from acidic vapors.

Disposal

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

References

  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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