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Barium azide

From Wikipedia, the free encyclopedia
Barium azide
Names
Other names
Barium dinitride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.038.706Edit this at Wikidata
EC Number
  • 242-594-6
UN number1687
  • InChI=1S/Ba.2N3/c;2*1-3-2/q+2;2*-1 checkY
    Key: UUXFWHMUNNXFHD-UHFFFAOYSA-N checkY
  • [Ba+2].[N-]=[N+]=[N-].[N-]=[N+]=[N-]
Properties
Ba(N3)2
Molar mass221.37 g/mol
AppearanceWhite crystalline solid
OdorOdourless
Density2.936 g/cm3[1]
Melting point126 °C (259 °F; 399 K)
Boiling point160 °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 inethanol0.017 g/100 mL (16 °C)[5]
Solubility inacetoneInsoluble
Solubility inetherInsoluble
Structure
Monoclinic
Hazards
GHS labelling:
GHS01: ExplosiveGHS06: Toxic
Danger
H200,H301,H315,H319,H331,H335
P210,P240,P264,P280,P305+P351+P338,P310
Safety data sheet (SDS)[1]
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound

Barium azide is an inorganicazide with the formulaBa(N3)2. It is abarium salt ofhydrazoic acid. Like all azides, it is explosive. It is less sensitive to mechanical shock thanlead azide.

Preparation

[edit]

Barium azide may be prepared by reactingsodium azide with a soluble barium salt:[6]

BaBr2 + 2 NaN3 → Ba(N3)2 + 2NaBr

Uses

[edit]

Barium azide can be used to make azides ofmagnesium,sodium,potassium,lithium,rubidium andzinc with their respective sulfates.[4]

Ba(N3)2 + Li2SO4 → 2 LiN3 + BaSO4

It can also be used as a source for high purity nitrogen by heating:

Ba(N3)2 → Ba + 3 N2

This reaction liberates metallic barium, which is used as agetter in vacuum applications.

See also

[edit]

References

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  1. ^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. Vol. 1.US Army Research and Development Command TACOM, ARDEChttp://www.dtic.mil/get-tr-doc/pdf?AD=AD0257189.{{cite encyclopedia}}:Missing or empty|title= (help)[dead link]
  2. ^Tiede, Erich (1916)."Die Zersetzung der Alkali- und Erdalkali-azide im Hochvakuum zur Reindarstellung von Stickstoff".Ber. Dtsch. Chem. Ges. (in German).49 (2):1742–1745.doi:10.1002/cber.19160490234.
  3. ^Audrieth, L. F. (1934). "Hydrazoic Acid and Its Inorganic Derivatives".Chem. Rev.15 (2):169–224.doi:10.1021/cr60051a002.
  4. ^abH. D. Fair; R. F. Walker, eds. (1977).Physics and Chemistry of the Inorganic Azides. Energetic Materials. Vol. 1. New York and London:Plenum Press.ISBN 9781489950093.
  5. ^Curtius, T.; Rissom, J. (1898)."Neue Untersuchungen über den Stickstoffwasserstoff N3H".J. Prakt. Chem. (in German).58 (1):261–309.doi:10.1002/prac.18980580113.
  6. ^Jobelius, Horst H.; Scharff, Hans-Dieter (2000). "Hydrazoic Acid and Azides".Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH.doi:10.1002/14356007.a13_193.ISBN 9783527306732.
Salts and covalent derivatives of theazide ion
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