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Hydrazoic acid

Hydrazoic acid
Hydrazoic acid structure
Chemical Name:
Hydrazoic acid
Azoimide;Triazoic acid;1H-Triazirine;Hydrazoic acid;hydrogen azide;Hydronitric acid;Hydrazoic acid (as vapour)
Molecular Formula:
Formula Weight:
MOL File:

Hydrazoic acid Properties

Melting point:
Boiling point:
bp 37°
4.72(at 25℃)
colorless liquid
Water Solubility 
very soluble H2O [HAW93]
Exposure limits
Ceiling 0.1 ppm vapor (ACGIH).
Unstable. Violently explosive in the concentrated or pure states. Readily forms explosive compounds with heavy metals. This is a dangerous and hard to handle substance which must not be prepared or handled by non-experts.


RIDADR  0473
HazardClass  1.1A
Toxicity LD50 in mice (mg/kg): 21.5 i.p. (Graham)

Hydrazoic acid price

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Hydrazoic acid Chemical Properties,Uses,Production

Chemical Properties

Colorless, volatile liquid; obnoxious odor.Soluble in water.


Industrially in preparation of heavy metal azides for shell detonators.


Hydrazoic acid is used in making heavymetal azides for detonators. It forms readilywhen sodium azide reacts with acid orhydrazine is mixed with nitrous acid.


A colorless liquid with a nauseating smell. It is highly poisonous and explodes in the presence of oxygen and oxidizing agents. It can be made by distilling a mixture of sodium azide (NaN3) and a dilute acid. It is usually used as an aqueous solution. The salts of hydrazoic acid (azides), especially lead azide (Pb(N3)2), are used in detonators because of their ability to explode when given a mechanical shock.


Dangerous explosion risk when shocked or heated. Strong irritant to eyes and mucous membranes.

Health Hazard

The acute toxicity of hydrazoic acidthrough inhalation and other routes of exposurehas been found to be high to very high.The symptoms and the intensity of poisoningare similar to sodium azide. It is, however,less toxic than hydrogen cyanide. Inhumans, inhalation of its vapors can produceirritation of eyes and respiratory tract, bronchitis,headache, dizziness, weakness, anddecreased blood pressure (Matheson 1983).Prolonged exposure to high concentrationscan result in collapse, convulsion, and death.An exposure to 1100 ppm for 1 hour waslethal to rats. Chronic exposure to a lowlevel of this compound in air may producehypotension.
Animals given intraperitoneal dosages ofhydrazoic acid showed the symptoms ofheavy breathing, convulsions, depression,and fall in blood pressure. It affected thecentral nervous system, but no damage wasobserved in the liver or kidney.
LD50 value, intraperitoneal (mice): 22 mg/kg.

Fire Hazard

In pure form or highly concentrated solution, hydrazoic acid is a dangerous explosive compound. It is unstable and sensitive to heat and shock. The explosion hazard decreases significantly with more dilute solutions.
It forms shock-sensitive metal azides when react with metal salts, and fluorine azide with fluorine (Lawless and Smith 1968) and susceptible to form chlorine azide and bromine azide with chlorine gas and bromine vapor. All these products can explode violently on impact. With carbon disulfide it forms a violently explosive salt (Mellor 1946; NFPA 1997).

Waste Disposal

Hydrazoic acid may be destroyed by convertingit to sodium azide. The latter isdecomposed with nitrous acid in a hood(National Research Council 1995). The followingmethod is used. It is diluted in waterto a strength below 5%; or its solution inorganic solvents that is immiscible in wateris shaken vigorously with water in a separatoryfunnel. The aqueous solution containinghydrazoic acid is neutralized with sodiumhydroxide and separated from any organiclayer. Sodium azide, so formed, is destroyedby reacting the aqueous solution with anexcess of sodium nitrite followed by 20%sulfuric acid until the solution is acidic. Thereaction is carried out in a three-necked flaskequipped with a stirrer, a dropping funnel,and a gas outlet line to vent out nitric oxide.The reaction mixture is flushed down thedrain.

Hydrazoic acid Preparation Products And Raw materials

Raw materials

Preparation Products

Hydrazoic acid Suppliers

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