2PdCl2 + 4(NH3•H2O) → [Pd(NH3)4][PdCl4] + 4H2O
Palladium(II) chloride react with ammonium hydroxide to produce tetraamminepalladium(II) tetrachloridopalladate(II) and water. Ammonium hydroxide - concentrated solution. The reaction takes place in a concentrated solution potassium chloride.