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Sodium arsenate
Names
	IUPAC name Trisodium arsorate
	Other names sodium arsenate
Identifiers
CAS Number	(anhydrous): 13464-38-5 ; (dodecahydrate): 13510-46-8; 7631-89-2;
3D model (JSmol)	(anhydrous): Interactive image; (heptahydrate): Interactive image; (dodecahydrate): Interactive image;
ChEBI	(anhydrous): CHEBI:84070 ;
ChemSpider	(anhydrous): 43027; (dodecahydrate): 29325835;
ECHA InfoCard	100.033.334
EC Number	(anhydrous): 236-682-3;
PubChem CID	(anhydrous): 47275; (heptahydrate): 23622126; (dodecahydrate): 57348098;
UNII	(anhydrous): 7XO134LHLN;
CompTox Dashboard (EPA)	(anhydrous): DTXSID9039367; (dodecahydrate): DTXSID20721563;
	InChI (anhydrous): InChI=1S/AsH3O4.3Na/c2-1(3,4)5;;;/h(H3,2,3,4,5);;;/q;3+1/p-3 Key: CDBAKLRDFBGJOX-UHFFFAOYSA-K; (heptahydrate): InChI=1S/AsH3O4.3Na.7H2O/c2-1(3,4)5;;;;;;;;;;/h(H3,2,3,4,5);;;;71H2/q;3+1;;;;;;;/p-3 Key: KOPCAWUPVBHZIP-UHFFFAOYSA-K; (dodecahydrate): InChI=1S/AsH3O4.3Na.12H2O/c2-1(3,4)5;;;;;;;;;;;;;;;/h(H3,2,3,4,5);;;;121H2/q;3*+1;;;;;;;;;;;;/p-3 Key: UVNGJDIGNLIVPE-UHFFFAOYSA-K;
	SMILES (anhydrous): [O-][As](=O)([O-])[O-].[Na+].[Na+].[Na+]; (heptahydrate): O.O.O.O.O.O.O.[O-][As](=O)([O-])[O-].[Na+].[Na+].[Na+]; (dodecahydrate): O.O.O.O.O.O.O.O.O.O.O.O.[O-][As](=O)([O-])[O-].[Na+].[Na+].[Na+];
Properties
Chemical formula	H24Na3AsO16 (dodecahydrate)
Molar mass	207.88851 g/mol
Appearance	colourless solid
Density	1.517 g/cm3 (dodecahydrate)
Solubility in water	soluble
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	toxic
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H331, H350, H410
Precautionary statements	P201, P202, P261, P264, P270, P271, P273, P281, P301+P310, P304+P340, P308+P313, P311, P321, P330, P391, P403+P233, P405, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) 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.^[2]

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.^[3] The anion AsO₄^3- exists at high pH, but below pH 11.5, it converts to HAsO₄^2- (also written HOAsO₃^2-).

References

^ "Trisodium arsenate".
^ 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.pub2. ISBN 978-3527306732.{{cite encyclopedia}}: CS1 maint: multiple names: authors list (link)
^ 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 Société Chimique de France 1970, vol. 6, pp. 2073-8.

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[1] "Trisodium arsenate".

[Ullmann-2] 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.pub2. ISBN 978-3527306732.{{cite encyclopedia}}: CS1 maint: multiple names: authors list (link)

[3] 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 Société Chimique de France 1970, vol. 6, pp. 2073-8.

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