Sodium nitrite

Sodium nitrite
The nitrite anion (space-filling model)
The nitrite anion (space-filling model)
The sodium cation
The sodium cation

Unit cell of sodium nitrite under standard conditions
Sodium nitrite
Names
IUPAC name
Sodium nitrite
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.028.687 Edit this at Wikidata
EC Number
  • 231-555-9
E number E250 (preservatives)
KEGG
RTECS number
  • RA1225000
UNII
UN number 1500 3287
  • InChI=1S/HNO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1 checkY
    Key: LPXPTNMVRIOKMN-UHFFFAOYSA-M checkY
  • InChI=1/HNO2.Na/c2-1-3;/h(H,2,3);/q;+1/p-1
    Key: LPXPTNMVRIOKMN-REWHXWOFAO
  • N(=O)[O-].[Na+]
Properties
NaNO2
Molar mass 68.9953 g/mol
Appearance white or slightly yellowish crystalline solid
Density 2.168 g/cm3
Melting point 271 °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 methanol 4.4 g/(100 mL)
Solubility in ethanol Soluble
Solubility in diethyl ether 0.3 g/(100 mL)
Solubility in ammonia Very soluble
Acidity (pKa) ~9
−14.5·10−6 cm3/mol
1.65
Structure[1]
Orthorhombic
Im2m
a = 3.5653(8) Å, b = 5.5728(7) Å, c = 5.3846(13) Å
2
Thermochemistry
106 J/(mol·K)
−359 kJ/mol[2]
−295 kJ/mol
Pharmacology
V03AB08 (WHO)
Hazards
GHS labelling:[3]
GHS03: OxidizingGHS06: ToxicGHS09: Environmental hazard
Danger
H272, H301, H319, H400
P220, P273, P301+P310, P305+P351+P338
NFPA 704 (fire diamond)
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).
☒N verify (what is checkY☒N ?)

Sodium nitrite is an inorganic compound with the chemical formula NaNO2. 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.[4]

  1. ^ Gohda T, Ichikawa M (November 1996). "The Refinement of the Structure of Ferroelectric Sodium Nitrite". Journal of the Korean Physical Society. 29: 551–554.
  2. ^ Zumdahl SS (2009). Chemical Principles (6th ed.). Houghton Mifflin Company. p. A23. ISBN 978-0-618-94690-7.
  3. ^ "GESTIS-Stoffdatenbank sodium nitrite". gestis.dguv.de. Retrieved 10 December 2021.
  4. ^ Laue W, Thiemann M, Scheibler E, Wiegand KW (2006). "Nitrates and Nitrites". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a17_265. ISBN 978-3-527-30673-2.