K2[PtCl6] + 6KCN → K2[Pt(CN)6] + 6KCl
Potassium hexachloridoplatinate(IV) react with potassium cyanide to produce hexacyanoplatinate(IV) potassium and potassium chloride. Potassium hexachloridoplatinate(IV) - saturated solution. Potassium cyanide - concentrated solution. This reaction takes place at a temperature near 0°C.