[Pt(NH3)4][PtCl4] + 4(NH4•H2O) 2[Pt(NH3)4]Cl2 + 4H2O
Tetraammineplatinum(II) tetrachloridoplatinate(II) react with ammonium hydroxide to produce tetraammineplatinum chloride and water. Ammonium hydroxide - concentrated solution. This reaction takes place at a temperature near 70°C.