Potassium azide
|
|||
 |
|||
| Names | |||
|---|---|---|---|
|
IUPAC name
Potassium azide
|
|||
| Identifiers | |||
|
3D model (Jmol)
|
|||
| ECHA InfoCard | 100.039.997 | ||
|
PubChem CID
|
|||
|
|||
|
|||
| Properties | |||
| KN 3 |
|||
| Molar mass | 81.1184 g/mol | ||
| Appearance | Colorless crystals | ||
| Density | 2.038 g/cm3 |
||
| Melting point | 350 °C (662 °F; 623 K) (in vacuum) | ||
| 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 | soluble in ethanol insoluble in ether |
||
| Thermochemistry | |||
|
Std enthalpy of
formation (ΔfH |
-1.7 kJ/mol | ||
| Hazards | |||
| Main hazards | Very Toxic, explosive if strongly heated | ||
| NFPA 704 | |||
| Lethal dose or concentration (LD, LC): | |||
|
LD50 (median dose)
|
27 mg/kg (oral, rat) | ||
| 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).
|
|||
 (what is   ?) |
|||
| Infobox references | |||
Potassium azide is the inorganic compound having the formula KN
3. 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.
KN3, RbN3, CsN3, and TlN3 adopt the same structures. They crystallize in a tetragonal habit. The azide is bound to eight cations in an eclipsed orientation. The cations are bound to eight terminal N centers.
KN3 is prepared by treating potassium carbonate with hydrazoic acid, which is generated in situ. In contrast, the analogous sodium azide is prepared (industrially) by the "Wislicenus process," which proceeds via the reaction sodium amide with nitrous oxide.
Upon heating or upon irradiation with ultraviolet light, it decomposes into potassium metal and nitrogen gas. The decomposition temperatures of the alkali metal azides are: NaN3 (275 °C), KN3 (355 °C), RbN3 (395 °C), CsN3 (390 °C).
Like sodium azide, potassium azide is very toxic. The TLV of the related sodium azide is 0.07 ppm. The toxicity of azides arise from their ability to inhibit .
...
Wikipedia