Sodium arsenite

Structural formula
General
Surname	Sodium arsenite
other names	Sodium metaarsenite
Molecular formula	NaAsO 2
Brief description	white to gray, hygroscopic solid
External identifiers / databases
EC number	232-070-5
ECHA InfoCard	100.029.154
PubChem	443495
Wikidata	Q419586
properties
Molar mass	129.91 g mol −1
Physical state	firmly
density	1.87 g cm −3
Melting point	150 ° C
solubility	easily soluble in water
safety instructions
H and P phrases	H: 300 + 310-331-350-410
	P: 201-261-264-273-280-301 + 310
MAK	repealed because it is carcinogenic
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium metaarsenite is an inorganic-chemical compound. It is the sodium salt of arsenic acid .

use

Sodium arsenite is used as a standard solution as a secondary standard when setting standard solutions for periodatometry .

Manufacturing

The solution is obtained directly from the original titer substance arsenic trioxide by reaction with sodium hydroxide solution . The pure substance is obtained by removing water:

{\ displaystyle \ mathrm {As_ {2} O_ {3} +2 \ NaOH \ rightleftharpoons 2 \ NaAsO_ {2} + \ H_ {2} O}}

properties

Sodium arsenite is a water-soluble solid that forms colorless and extremely poisonous hygroscopic crystals. It absorbs carbon dioxide .

safety instructions

Sodium arsenite is a contact poison and can cause genetic changes, inflammation and irritation of the eyes, lungs and mucous membranes. The following applies to all ingestion or contact: Rinse immediately with water and if accidentally swallowed or inhaled, a doctor should be contacted. Keep out of the reach of children and wear suitable gloves when working with sodium arsenite.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Entry on sodium arsenite in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry arsenic compounds, with the exception of those named in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Entry on sodium arsenite in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .

[CLP_100.240.769-2] Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the specified labeling it falls under the group entry arsenic compounds, with the exception of those named in this appendix in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA) on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .