PtCl2 + 4(NH3•H2O) + H2O2 → [Pt(NH3)4Cl2](OH)2 + 4H2O
Platinum(II) chloride react with ammonium hydroxide and hydrogen peroxide to produce hydroxide trance-dichloridotetraammineplatinum(IV) and water. Ammonium hydroxide and sodium hydroxide - concentrated solutions.