Related Searches

Hydrazoic acid

Hydrazoic acid

| Section8 = }}

Hydrazoic acid, HN3, is a colorless, volatile, and extremely explosive liquid at room temperature and pressure.


Hydrazoic acid is used primarily for preservation of stock solutions, and as a reagent.


It was first isolated in 1890 by Theodor Curtius (Berichte, 1890, 23, p. 3023).


It is soluble in water, and the solution dissolves many metals (e.g. zinc, iron) with liberation of hydrogen and formation of salts (azides, formerly also called azoimides or hydrazoates).

All the salts are explosive and readily interact with the alkyl iodides. In its properties hydrazoic acid shows some analogy to the halogen acids, since it forms poorly soluble lead, silver and mercurous salts (in water). The metallic salts all crystallize in the anhydrous form and decompose on heating, leaving a residue of the pure metal. It is a weak acid (pKa 4.6-4.7).


The acid is usually formed by acidification of an azide salt like sodium azide. Normally solutions of sodium azide in water contain trace quantities of hydrazoic acid in equilibrium with the azide salt, but introduction of a stronger acid can convert the primary species in solution to hydrazoic acid. The pure acid may be subsequently obtained by fractional distillation as an extremely explosive colorless liquid with an unpleasant smell.


Hydrazoic acid is volatile and highly toxic. It has a pungent smell and its vapor can cause violent headaches. The compound acts as a non-cumulative poison.


  • Dictionary of inorganic and organometallic compounds, Chapman & Hall

External links

Search another word or see hydrazoic acidon Dictionary | Thesaurus |Spanish
Copyright © 2015, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature