Potassium azide

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Potassium azide
Names
IUPAC name
Potassium azide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.039.997 Edit this at Wikidata
EC Number
  • 244-013-1
UNII
  • InChI=1S/K.N3/c;1-3-2/q+1;-1
    Key: TZLVRPLSVNESQC-UHFFFAOYSA-N
  • [N-]=[N+]=[N-].[K+]
Properties
KN3
Molar mass 81.1184 g/mol
Appearance Colorless crystals[1]
Density 2.038 g/cm3
 [1]
Melting point 350 °C (662 °F; 623 K) (in vacuum)[1]
Boiling point decomposes
41.4 g/100 mL (0 °C)
50.8 g/100 mL (20 °C)
105.7 g/100 mL (100 °C)
Solubility 0.1375 g/100 g in ethanol (16 °C)[2]
insoluble in ether
Thermochemistry
−1.7 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Very Toxic, explosive if strongly heated
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability 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
4
3
3
Lethal dose or concentration (LD, LC):
27 mg/kg (oral, rat)[3]
Related compounds
Other cations
 Sodium azide, copper(II) azide, lead(II) azide, silver azide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium azide is the inorganic compound having the formula KN3. It is a white, water-soluble salt. It is used as a reagent in the laboratory.

It has been found to act as a nitrification inhibitor in soil.[4]

KN3, RbN3, CsN3, and TlN3 adopt the same structures. They crystallize in a tetragonal habit.[5] The azide is bound to eight cations in an eclipsed orientation. The cations are bound to eight terminal N centers.[6]

Coordination sphere of azide in K,Rb,Cs,TlN3

Synthesis and reactions

Health hazards

References

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