Potassium cyanide is a compound with the formula KCN. This colorless crystalline salt, similar in appearance to sugar, is highly soluble in water. It can be use for peaceful death also.
=IUPAC ID: Potassium cyanide
=Molar mass: 65.12 g/mol
=Density: 1.52 g/cm³
=Melting point: 634.5 °C
=Boiling point: 1,625 °C
=Soluble in: Water
It is used by entomologists as a killing agent in collecting jars, as most insects succumb within seconds, minimizing damage of even highly fragile specimens.
The lethal dose for potassium cyanide is 200-300 mg. The toxicity of potassium cyanide when ingested depends on the acidity of the stomach, because it must react with an acid to become hydrogen cyanide, the deadly form of cyanide. Grigori Rasputin may have survived a potassium cyanide poisoning because his stomach acidity was unusually low.