KCN is formed because of the treatment of hydrogen cyanide with aqueous potassium hydroxide solution, followed by the vacuum evaporation in the solution: HCN + KOH KCN + H2O. It produces about 50,000 a ton of potassium cyanide each year.Potassium cyanide acts on mitochondrial cytochrome c oxidase to impede oxidative phosphorylation and is also a st