Barium selenite

Structural formula
General
Surname	Barium selenite
Molecular formula	BaSeO 3
Brief description	white to pink solid
External identifiers / databases
CAS number 13718-59-7 EC number 237-280-0 ECHA InfoCard 100,033,876 PubChem 166893 Wikidata Q9335139
properties
Molar mass	264.28 g mol −1
Physical state	firmly
Melting point	950 ° C (decomposition)
solubility	practically insoluble in water
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 331-301-373-410 P: 260-301 + 310-304 + 340-320-330-361-405-501
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Barium selenite is an inorganic chemical compound of barium from the selenite group .

Extraction and presentation

Barium selenite can be obtained by reacting sodium selenite with barium chloride solutions .

${\displaystyle \mathrm {Na_{2}SeO_{3}+BaCl_{2}\longrightarrow BaSeO_{3}\downarrow +\ 2\ NaCl} }$

The synthesis is also possible by reacting a barium chloride solution with selenous acid and adding sodium carbonate to start the precipitation.

properties

Barium selenite is a white solid in its pure state. Technical products are colored cream or pink due to traces of elemental selenium. It is practically insoluble in water and stable in the pH range between 4.6 and 13.7. In air it is stable up to 700 ° C and then oxidizes to barium selenate .

${\displaystyle \mathrm {2\ BaSeO_{3}+O_{2}\longrightarrow 2\ BaSeO_{4}} }$

use

Barium selenite is used to color or decolorize glass or to manufacture high-index glasses .

Related links

In addition to barium selenite, there is another barium selenite with barium diselenite BaSe ₂ O ₅ .

Individual evidence

1. ↑ ^{a b c d e f g h i} Richard C. Ropp: Encyclopedia of the Alkaline Earth Compounds . Newnes, 2012, ISBN 0-444-59553-8 , pp. 180 ( limited preview in Google Book Search).
2. ↑ ^{a b c d} Entry for CAS no. 13718-59-7 in the GESTIS substance database of the IFA , accessed on July 8, 2016(JavaScript required) .
3. ↑ Not explicitly listed in Regulation (EC) No. 1272/2008 (CLP) , but with the indicated labeling it falls under the group entries for barium salts, with the exception of barium sulphate, salts of 1-azo-2-hydroxynaphthalenyl aryl sulphonic acid , and of salts specified elsewhere in this Annex and selenium compounds with the exception of cadmium sulphoselenide and those specified elsewhere in this Annex in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on March 18, 2017. Manufacturers or distributors can use the expand harmonized classification and labeling .
4. ↑ ^{a b} Data sheet Barium selenite, 97% from AlfaAesar, accessed on July 8, 2016 ( PDF )(JavaScript required) .