Ammonium arsenate

Ammonium arsenate
Names
Other names
Ammonium orthoarsenate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.152
EC Number
  • 246-428-3
  • InChI=1S/AsH3O4.3H3N/c2-1(3,4)5;;;/h(H3,2,3,4,5);3*1H3 Y
    Key: SNSGFXVMSAYXTC-UHFFFAOYSA-N Y
  • InChI=1/AsH3O4.2H3N/c2-1(3,4)5;;/h(H3,2,3,4,5);2*1H3
    Key: XPVHUBFHKQQSDA-UHFFFAOYAT
  • [NH4+].[NH4+].[NH4+].[O-][As](=O)([O-])[O-]
Properties
(NH4)3AsO4 . 3 H2O
Molar mass 247.1 (trihydrate)
Soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

Ammonium arsenate is an inorganic compound with the formula ((NH4)3AsO4, typically encountered as a trihydrate, (NH4)3AsO4·3H2O. It is a colorless, water-soluble crystalline solid that decomposes upon heating, releasing ammonia and forming arsenic-containing residues.

Classified as an IARC Group 1 carcinogen, it is highly toxic and poses significant health and environmental risks.

Historically used in pesticides and analytical chemistry, its applications are now limited due to toxicity concerns. Ammonium arsenate occurs rarely in nature and is primarily synthesized for research or industrial purposes. Its chemistry, environmental behavior, and analytical detection are of interest in toxicology, environmental chemistry, and biogeochemistry.

It is prepared by treating a concentrated solution of arsenic acid with ammonia, resulting in precipitation of colorless crystals of the trihydrate. Upon heating, it releases ammonia.

Acid salts are also known, including diammonium arsenate and ammonium dihydrogen arsenate.

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