Lead(II) azide

Lead(II) azide

chembox
ImageFile = Lead(II) azide.png ImageSize =
IUPACName =
OtherNames =
Section1 = Chembox Identifiers
CASNo = 13424-46-9
UNNumber = 0129
PubChem = 61600
SMILES =
Section2 = Chembox Properties
Formula = Pb(N3)2
MolarMass =
Appearance =
Density = 4.71 g/cm3, solid
MeltingPt =
BoilingPt =
Solubility =
Section3 = Chembox Explosive
ShockSens = High
FrictionSens = High
ExplosiveV = 5180 m/s
REFactor =
Section4 = Chembox Hazards
MainHazards =
FlashPt =
Autoignition =

Lead azide (Pb(N3)2) is an explosive and toxic crystalline compound. It is used as a detonator for other, secondary, explosives. The white crystals have a density of 4.71 g/cm³. In a commercially usable form it is a white-to-buff powder.

tability

Lead azide is not very hygroscopic, and water does not reduce its impact sensitivity. When protected from humidity, is completely stable in storage.Fact|date=May 2008

Preparation

Lead azide is prepared by metathesis between sodium azide and lead nitrate or lead dissolved in nitric acid. Dextrose can be added to the solution to stabilize the product.

Exploding bullets

Lead azide was one of the ingredients of the six .22 caliber Devastator rounds fired by John Hinckley, Jr. in his assassination attempt on President Ronald Reagan on March 30, 1981. The rounds consisted of lead azide centers with lacquer-sealed aluminum tips designed to explode upon impact. None of the six bullets hit the president directly. The one that did strike the President in the chest after ricocheting off of the bullet proof glass of the presidential limousine did not explode as designed. Nor did the other five, though three others were wounded, including press secretary James Brady who was partially paralyzed. [The Exploding Bullets, by Pete Barley and Charles Babcock, "Washington Post", 4 Apr, 1981. Retrieved 28 February, 2007.]

afety

Lead azide is highly sensitive and usually handled and stored under water in insulated rubber containers. It will explode after a fall of around 150 mm (6 in) or in the presence of a static discharge of 7 millijoules. Its detonation velocity is around 5.18 km/s (17,500 ft/s).

Ammonium acetate and sodium dichromate are used to destroy small quantities of lead azide.

Lead azide reacts with copper, zinc, cadmium, or alloys containing these metals to form other azides. For example, copper azide is even more explosive and too sensitive to be used commercially. Sodium azide is used both for the manufacture of lead azide and as preservative and diluent, which can lead to problems.Fact|date=May 2008

ee also

* Lead styphnate

References

External links

* [http://www.npi.gov.au/database/substance-info/profiles/50.html National Pollutant Inventory - Lead and Lead Compounds Fact Sheet]


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