nh4 no2

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Ammonium nitrite
IUPAC name

Ammonium nitrite

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CAS Number

  • 13446-48-5 check

3D model (JSmol)

  • Interactive image
  • 24223 check
ECHA InfoCard 100.033.257 Edit this at Wikidata
EC Number
  • 236-598-7

PubChem CID

  • 26004
  • 71ZQG69956

CompTox Dashboard (EPA)

  • DTXSID7065461 Edit this at Wikidata


  • InChI=1S/HNO2.H3N/c2-1-3;/h(H,2,3);1H3 check


  • InChI=1/HNO2.H3N/c2-1-3;/h(H,2,3);1H3



  • [O-]N=O.[NH4+]


Chemical formula

Molar mass 64.04 g/mol
Appearance colorless or pale yellow crystals
Density 1.69 g/cm3
Melting point Decomposes
118.3 g / 100mL
Explosive data
Shock sensitivity Low
Friction sensitivity Low
Detonation velocity >1000 m/s
Occupational safety and health (OHS/OSH):

Main hazards

GHS labelling:


GHS01: Explosive GHS07: Exclamation mark

Signal word

NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 3: Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked. E.g. hydrogen peroxideSpecial hazards (white): no code



Flash point Non-flammable


Related compounds

Other anions

Ammonium 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).

Infobox references

Ammonium nitrite, [NH4]NO2, is the ammonium salt of nitrous acid. It is not used in pure isolated size since it is highly unstable and decomposes into water and nitrogen, even at room temperature.


Ammonium nitrite forms naturally in the air and can be prepared by the absorption of equal parts nitrogen dioxide and nitric oxide in aqueous ammonia.[1]

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It can also be synthesized by oxidizing ammonia with ozone or hydrogen peroxide, or in a precipitation reaction of barium or lead nitrite with ammonium sulfate, or silver nitrite with ammonium chloride, or ammonium perchlorate with potassium nitrite. The precipitate is filtered off and the solution concentrated. It forms colorless crystals which are soluble in water.

Physical and chemical properties[edit]

Ammonium nitrite may explode at a temperature of 60–70 °C,[1] and will decompose quicker when dissolved in a concentrated aqueous solution, than vãn in the size of a dry crystal. Even in room temperature the compound slowly decomposes into water and nitrogen:

[NH4]NO2 → N2 + 2 H2O

It decomposes when heated or in the presence of acid into water and nitrogen.[2] Ammonium nitrite solution is stable at higher pH and lower temperature. If there is any decrease in pH lower than vãn 7.0, it may lead to tướng an explosion, since the nitrite can react to tướng it. A safe pH can be maintained by adding an ammonia solution. The mole ratio of ammonium nitrite to tướng ammonia must be above 10%.