Chemistry:Barium azide
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| Names | |
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| Other names
Barium dinitride
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| UN number | 1687 |
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| Properties | |
| Ba(N 3) 2 | |
| Molar mass | 221.37 g/mol |
| Appearance | White crystalline solid |
| Odor | Odourless |
| Density | 2.936 g/cm3[1] |
| Melting point | 126 °C (259 °F; 399 K) |
| Boiling point | 160 °C (320 °F; 433 K) (initial decomposition)[2] >217 °C (deflagrates) 180 °C (initial decomposition),[3] 225 °C explosion |
| 11.5 g/100 mL (0 °C) 14.98 g/100 mL (15.7 °C) 15.36 g/100 mL (20 °C) 22.73 g/100 mL (52.1 °C) 24.75 g/100 mL (70 °C)[4] | |
| Solubility in acetone | Insoluble |
| Solubility in ether | Insoluble |
| Structure | |
| Monoclinic | |
| Hazards | |
| Safety data sheet | [1] |
| GHS pictograms |  
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| GHS Signal word | Danger |
| H200, H301, H331, H315, H319, H335 | |
| P210, P240, P264, P280, P305+351+338, P310 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
Barium azide is an inorganic azide with the formula Ba(N
3)
2. It is a barium salt of hydrazoic acid. Like most azides, it is explosive. It is less sensitive to mechanical shock than lead azide.
Preparation
Barium azide may be prepared by reacting sodium azide with a soluble barium salt. Care should be taken to prevent large crystals from forming in the solution as barium azide crystals will explode if subjected to friction/shock or if fully dried. The product should be stored submerged in ethanol.[citation needed]
Uses
Barium azide can be used to make azides of magnesium, sodium, potassium, lithium, rubidium and zinc with their respective sulfates.[4]
- Ba(N
3)
2 + Li
2SO
4 → 2 LiN
3 + BaSO
4
It can also be used as a source for high purity nitrogen by heating:
- Ba(N
3)
2 → Ba + 3 N
2
This reaction liberates metallic barium, which is used as a getter in vacuum applications.
See also
References
- ↑ Fedoroff, Basil T.; Aaronson, Henry A.; Reese, Earl F.; Sheffield, Oliver E.; Clift, George D.; Dunkle, Cyrus G.; Walter, Hans; McLean, Dan C. (1960). Encyclopedia of Explosives and Related Items. 1. US Army Research and Development Command TACOM, ARDEC. http://www.dtic.mil/get-tr-doc/pdf?AD=AD0257189.[|permanent dead link|dead link}}]
- ↑ Tiede, Erich (1916). "Die Zersetzung der Alkali- und Erdalkali-azide im Hochvakuum zur Reindarstellung von Stickstoff" (in de). Ber. Dtsch. Chem. Ges. 49 (2): 1742–1745. doi:10.1002/cber.19160490234. https://zenodo.org/record/1426607.
- ↑ Audrieth, L. F. (1934). "Hydrazoic Acid and Its Inorganic Derivatives". Chem. Rev. 15 (2): 169–224. doi:10.1021/cr60051a002.
- ↑ 4.0 4.1 Physics and Chemistry of the Inorganic Azides. Energetic Materials. 1. New York and London: Plenum Press. 1977. ISBN 9781489950093.
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