Sodium arsenite

Sodium arsenite
Names
	IUPAC name sodium arsenite
	Other names sodium arsenate(III)
Identifiers
CAS Number	7784-46-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29678 ;
ChEMBL	ChEMBL1909078;
ECHA InfoCard	100.029.154
EC Number	232-070-5;
KEGG	C11906 ;
PubChem CID	443495;
RTECS number	CG3675000;
UNII	48OVY2OC72 ;
UN number	1686 2027
CompTox Dashboard (EPA)	DTXSID5020104 ;
	InChI InChI=1S/AsHO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1;
	SMILES [O-][As]=O.[Na+];
Properties
Chemical formula	NaAsO2
Molar mass	129.91 g/mol
Appearance	white or grayish powder ; hygroscopic
Density	1.87 g/cm 3
Melting point	550 °C (1,022 °F; 823 K) decomposes
Solubility in water	156 g/100 mL
Solubility	slightly soluble in alcohol
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H301, H310, H331, H350, H410
Precautionary statements	P201, P202, P261, P262, P264, P270, P271, P273, P280, P281, P301+P310, P302+P350, P302+P352, P304+P340, P308+P313, P310, P311, P312, P321, P322, P330, P361, P363, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 0
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	41 mg/kg (rat, oral)
	NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1018] TWA 0.010 mg/m3
REL (Recommended)	Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)	Ca [5 mg/m3 (as As)]
Safety data sheet (SDS)	External MSDS
	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 arsenite usually refers to the inorganic compound with the formula NaAsO₂. Also called sodium meta-arsenite, it is an inorganic polymer consisting of the infinite chains [AsO₂]ⁿ⁻
_n associated with sodium cations, Na⁺. The polymer backbone has the connectivity -O-As(O⁻)-.backbone. Sodium ortho-arsenite is Na₃AsO₃. Both compounds are colourless solids. A mixture of sodium meta-arsenite and sodium ortho-arsenite is produced by treating arsenic trioxide with sodium carbonate or sodium hydroxide. Sodium arsenite is amorphous, typically being obtained as a powder or as a glassy mass.