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Barium nitrite

Names
Preferred IUPAC name Barium nitrite
Identifiers
CAS Number	13465-94-6 (anhydrous) 7787-38-4 (monohydrate)
3D model (JSmol)	Interactive image
ChemSpider	145952
ECHA InfoCard	100.033.358
EC Number	236-709-9
PubChem CID	166820
UNII	5N5G361962
CompTox Dashboard (EPA)	DTXSID30890698
InChI InChI=1S/Ba.2HNO2/c;2*2-1-3/h;2*(H,2,3)/q+2;;/p-2 Key: GJTDJAPHKDIQIQ-UHFFFAOYSA-L
SMILES N(=O)[O-].N(=O)[O-].[Ba+2]
Properties
Chemical formula	Ba(NO2)2
Molar mass	229.34 g/mol
Appearance	white (anhydrous) white to yellowish (monohydrate)
Density	3.234 g/cm3 (anhydrous) 3.173 g/cm3 (monohydrate)
Melting point	267 °C (anhydrous) 217 °C decomposes (monohydrate)
Solubility in water	anhydrous 675 g/L (20 °C) monohydrate 548 g/L (0 °C) 3190 g/L (100 °C)
Solubility	anhydrous slightly soluble in ethanol monohydrate soluble in ethanol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Toxic
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H332
Precautionary statements	P261, P264, P270, P271, P301+P317, P304+P340, P317, P330, P501
Related compounds
Related compounds	Sodium nitrite Potassium nitrite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Barium nitrite is a chemical compound with the formula Ba(NO₂)₂, the nitrous acid salt of barium. It is a water-soluble white to yellowish powder. It is used to prepare other metal nitrites, such as lithium nitrite.

Synthesis

Barium nitrite can be prepared by reacting barium nitrate with lead metal sponge, or by reaction of lead nitrite with barium chloride.

The monohydrate can be crystallized from a stoichiometric solution of barium chloride and sodium nitrite.