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Sodium nitrite

Sodium nitrite
Unit cell of sodium nitrite under standard conditions
Names IUPAC name
Sodium nitrite
Preferred IUPAC name
Sodium nitrite
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.028.687EC Number
  • 231-555-9
E numberE250 (preservatives)KEGG
RTECS number
  • RA1225000
UNII
UN number1500 3287
  • InChI=1S/HNO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1
    Key: LPXPTNMVRIOKMN-UHFFFAOYSA-M
  • InChI=1/HNO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1
    Key: LPXPTNMVRIOKMN-REWHXWOFAO
  • N(=O)[O-].[Na+]
Properties NaNO2Molar mass68.9953 g/mol Appearance white or slightly yellowish crystalline solid Density2.168 g/cm Melting point271 °C (520 °F; 544 K) (decomposes at 320 °C)
  • 71.4 g/(100 mL) (0 °C)
  • 84.8 g/(100 mL) (25 °C)
  • 160 g/(100 mL) (100 °C)
Solubility in methanol4.4 g/(100 mL) Solubility in ethanolSoluble Solubility in diethyl ether0.3 g/(100 mL) Solubility in ammoniaVery soluble Acidity (pKa) ~9 −14.5·10 cm/mol 1.65 Structure OrthorhombicIm2m
a = 3.5653(8) Å, b = 5.5728(7) Å, c = 5.3846(13) Å
2 Thermochemistry 106 J/(mol·K) −359 kJ/mol −295 kJ/mol Pharmacology V03AB08 (WHO) Hazards GHS labelling: DangerH272, H301, H319, H400P220, P273, P301+P310, P305+P351+P338NFPA 704 (fire diamond)
3
0
1
OX
489 °C (912 °F; 762 K) Lethal dose or concentration (LD, LC): 180 mg/kg (rats, oral) Safety data sheet (SDS) "Sodium nitrite". Safety Data Sheet. Sigma-Aldrich. 28 December 2022.Related compounds
Other anions
Sodium nitrate
Other cations
Related compounds
Nitrous acid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium nitrite is an inorganic compound with the chemical formulaNaNO2. It is a white to slightly yellowish crystalline powder that is very soluble in water and is hygroscopic. From an industrial perspective, it is the most important nitrite salt. It is a precursor to a variety of organic compounds, such as pharmaceuticals, dyes, and pesticides, but it is probably best known as a food additive used in processed meats and (in some countries) in fish products.

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