Hydrogen cyanide
Waterstofcyanide · Cyjanowodór · Cianeto de hidrogénio · Acid cianhidric · Синильная кислота · Цијановодонична киселина · Hidrojen siyanür · Синильна кислота · Sianid · 氰化氢 · Cyanure d'hydrogène · מימן ציאנידי
| CAS | 74-90-8 |
|---|---|
| EC | 200-821-6 |
| UN | 1051 |
| Formula | HCN |
| Molar mass | 27.025 g/mol |
| LEL | 5.4 % vol |
| UEL | 46.0 % vol |
| Flash point | -20 °C |
| Autoignition temperature | 538 °C |
| Temperature class | T1 |
| Gas group | IIB |
| Relative density of the gas or vapour (air = 1) | 0.933 |
| GHS | Danger · H224, H330, H400, H410 |
Hydrogen cyanide is a one-carbon compound consisting of a methine group triple bonded to a nitrogen atom. It has a role as a poison, an Escherichia coli metabolite and a human metabolite. Hydrocyanic acid, aqueous solution, with not more than 20% hydrogen cyanide is a clear colorless aqueous solution of a gas. Has a faint odor of almonds. Can evolve hydrogen cyanide gas, which is (barely) lighter than air.