2KAl(SO4)2 + 6(NH3•H2O) → 2AlO(OH) + K2SO4 + 3(NH4)2SO4 + 2H2O
Aluminium-potassium sulfate react with ammonium hydroxide to produce aluminium metahydroxide, potassium sulfate, ammonium sulfate and water. Ammonium hydroxide - concentrated heated solution.