Barium nitrite

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.^[1] It is used to prepare other metal nitrites, such as lithium nitrite.

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)[1] white to yellowish (monohydrate)[1]
Density	3.234 g/cm3 (anhydrous)[1] 3.173 g/cm3 (monohydrate)[1]
Melting point	267 °C (anhydrous)[1] 217 °C decomposes[1] (monohydrate)
Solubility in water	anhydrous 675 g/L (20 °C)[1] monohydrate 548 g/L (0 °C)[1] 3190 g/L (100 °C)[1]
Solubility	anhydrous slightly soluble in ethanol[1] 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

Synthesis

Barium nitrite can be prepared by reacting barium nitrate with lead metal sponge, or by reaction of lead nitrite with barium chloride.^[2]

The monohydrate can be crystallized from a stoichiometric solution of barium chloride and sodium nitrite.^[1]