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Cyanide is usually made using ammonia, methane, and oxygen with a platinum catalyst.

2CH4 + 2 NH3 + 3O2 --> 2HCN + 6 H2O

The cyanide is in the form of hydrogen cyanide, which is liquid at room temperature, but will readily become a gas.

The common solid, water-soluble forms of potassium cyanide (KCN) and sodium cyanide (NaCN) are made by reacting hydrogen cyanide with the corresponding hydroxide in water. For example:

KOH + HCN --> KCN + H2O.

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