[Pd(NH3)4]Cl2 + 4NaOH + 4H2O → Na2[Pd(OH)4] + 4(NH3•H2O) + 2NaCl
Tetraamminepalladium(II) chloride react with sodium hydroxide and water to produce sodium tetrahydroxopalladate(II), ammonium hydroxide and sodium chloride. Sodium hydroxide - concentrated solution.