Sodium arsenite

Sodium arsenite

Names
IUPAC name sodium arsenite
Other names sodium arsenate(III)
Identifiers
CAS Number	7784-46-5 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:29678 N
ECHA InfoCard	100.029.154
EC Number	232-070-5
KEGG	C11906 N
PubChem CID	443495
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	129.911 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
Safety data sheet	External MSDS
R-phrases (outdated)	R23,R25,R45
NFPA 704	0 4 0
Lethal dose or concentration (LD, LC):
LD50 (median dose)	41 mg/kg (rat, oral)
US health exposure limits (NIOSH):
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)]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Sodium arsenite usually refers to the inorganic compound with the formula NaAsO₂. Also called sodium meta-arsenite, it is the sodium salt of arsenous acid. Sodium arsenite also ) Na₃AsO₃, called sodium ortho-arsenite. The 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. The compound consists of the polymer [AsO₂]n−
n associated with sodium cations, Na⁺. The polymer backbone has the connectivity -O-As(O⁻)-.

Sodium arsenite can be inhaled or absorbed through the skin. Along with its known carcinogenic and teratogenic effects, contact with the substance can yield symptoms such as skin irritation, burns, itching, thickened skin, rash, loss of pigment, poor appetite, a metallic or garlic taste, stomach pain, nausea, vomiting, diarrhea, convulsions, decreased blood pressure, and headache. Severe acute poisoning may lead to nervous system damage resulting in weakness, poor coordination, or “pins and needles” sensations, eventual paralysis, and death.