Sodium arsenate

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Sodium arsenate
IUPAC name
Sodium dihydrogen arsenate
Other names
sodium arsenate
ECHA InfoCard 100.033.334
H24Na3AsO16 (dodecahydrate)
Molar mass 207.88851 g/mol
Appearance colourless solid
Density 1.517 g/cm3 (dodecahydrate)
Main hazards toxic
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

Sodium arsenate is the inorganic compound with the formula Na3AsO4. Related salts are also called sodium arsenate, including Na2HAsO4 (disodium hydrogen arsenate) and NaH2AsO4 (sodium dihydrogen arsenate). The trisodium salt is a white or colourless solid that is highly toxic. It is usually handled as the dodecahydrate Na3AsO4.12H2O.[1]

The compound can be obtained by neutralizing arsenic acid:

H3AsO4 + 3 NaOH → Na3AsO4 + 3 H2O

The salt (as its dodecahydrate) is isomorphous with trisodium phosphate.[2]


  1. ^ Grund, S. C.; Hanusch, K.; Wolf, H. U., "Arsenic and Arsenic Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a03_113.pub2CS1 maint: Multiple names: authors list (link)
  2. ^ Remy, Francis; Guerin, Henri "Radiocrystallographic study of dodecahydrate trisodium arsenate and vanadate Na3AsO4.12H2O and Na3VO4.12H2O, and some hydrates of fluorinated or hydroxylated salts of general formula: M3XO4.xMY.(10 - x)H2O where M = Na, K; X = P, As, V and Y = F, OH" Bulletin de la Societe Chimique de France 1970, vol. 6, pp. 2073-8.