K2[PtCl4] + H2O2 + 2(NH3•H2O) → [Pt(NH3)2Cl4] + 2KOH + 2H2O
Potassium tetrachloridoplatinate(II) react with hydrogen peroxide and ammonium hydroxide to produce cis-tetrachloridodiammineplatinum, potassium hydroxide and water. Ammonium hydroxide - concentrated solution.