Potassium nitrite

Potassium nitrite

Identifiers
CAS Number	7758-09-0 Y
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL3186418
ChemSpider	22857 Y
ECHA InfoCard	100.028.939
EC Number	231-832-4
E number	E249 (preservatives)
PubChem CID	516910
RTECS number	TT3750000
UNII	794654G42L Y
UN number	1488
CompTox Dashboard (EPA)	DTXSID5042320
InChI InChI=1S/K.HNO2/c;2-1-3/h;(H,2,3)/q+1;/p-1 Y Key: BXNHTSHTPBPRFX-UHFFFAOYSA-M Y InChI=1/K.HNO2/c;2-1-3/h;(H,2,3)/q+1;/p-1 Key: BXNHTSHTPBPRFX-REWHXWOFAI
SMILES [K+].[O-]N=O
Properties
Chemical formula	KNO2
Molar mass	85.10379 g/mol
Appearance	white or slight yellow solid deliquescent
Density	1.914986 g/cm3
Melting point	440.02 °C (824.04 °F; 713.17 K) (decomposes)
Boiling point	537 °C (999 °F; 810 K) (explodes)
Solubility in water	281 g/100 mL (0 °C) 312 g/100 mL (25 °C) 413 g/100 mL (100 °C)
Solubility	soluble in alcohol, ammonia
Magnetic susceptibility (χ)	−23.3·10−6 cm3/mol
Thermochemistry
Heat capacity (C)	107.4 J/mol K
Std enthalpy of formation (ΔfH⦵298)	-369.8 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H301, H400
Precautionary statements	P210, P220, P221, P264, P270, P273, P280, P301+P310, P321, P330, P370+P378, P391, P405, P501
NFPA 704 (fire diamond)	3 0 2 OX
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose)	235 mg/kg
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Potassium nitrate
Other cations	Sodium nitrite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Potassium nitrite (distinct from potassium nitrate) is the inorganic compound with the chemical formula KNO₂. It is an ionic salt of potassium ions K⁺ and nitrite ions NO₂⁻, which forms a white or slightly yellow, hygroscopic crystalline powder that is soluble in water.^[1]

It is a strong oxidizer and may accelerate the combustion of other materials. Like other nitrite salts such as sodium nitrite, potassium nitrite is toxic if swallowed, and laboratory tests suggest that it may be mutagenic or teratogenic. Gloves and safety glasses are usually used when handling potassium nitrite.