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KCN is formed because of the treatment of hydrogen cyanide with aqueous potassium hydroxide solution, followed by the vacuum evaporation of your solution: HCN + KOH KCN + H2O. It makes about 50,000 lots of potassium cyanide every year.Potassium cyanide is really an inorganic compound with the chemical formula KCN, also called potassium cyanide or p