File:Hydrogen-azide-2D-dimensions.png · Wikimedia Commons · See Wikimedia Commons
hydrogen azide
Sign in to saveAlso known as N3H, [NNNH], triazoic acid, hydrazoic acid, HN3, HN₃, azoimide, azoimid
unstable, toxic chemical compound
Chemical data
- Formula
- HN3
- Molecular weight
- 43.029 g/mol
- SMILES
- N=[N+]=[N-]
- InChIKey
- JUINSXZKUKVTMD-UHFFFAOYSA-N
- XLogP
- 1.7
- Polar surface area
- 25.9 Ų
- H-bond donors
- 1
- H-bond acceptors
- 2
- Formal charge
- 0
via PubChem
Wikidata facts
- Mass
- 43.017
Show 9 more facts
- canonical SMILES
- N=[N+]=[N-]
- Commons category
- Hydrogen azide
- chemical formula
- HN₃
- ionization energy
- 10.72
- melting point
- -80
- density
- 1.09
- boiling point
- 35.7
- pKa
- 4.64
- electric dipole moment
- 1.70
via Wikidata · CC0
~6 min read
Article
Hydrazoic acid, also known as hydrogen azide or azoimide, is a compound with the chemical formula HN3. It is a colorless, volatile, and explosive liquid at room temperature and pressure. It is a compound of nitrogen and hydrogen, and is therefore a pnictogen hydride. It was first isolated in 1890 by Theodor Curtius. The acid has few applications, but its conjugate base, the azide ion, is useful in specialized processes.
Hydrazoic acid, like its fellow mineral acids, is soluble in water. Undiluted hydrazoic acid is dangerously explosive with a standard enthalpy of formation ΔfH (l, 298K) = +264 kJ/mol. When dilute, the gas and aqueous solutions (<10%) can be safely prepared but should be used immediately; because of its low boiling point, hydrazoic acid is enriched upon evaporation and condensation such that dilute solutions incapable of explosion can form droplets in the headspace of the container or reactor that are capable of explosion.