我做过，希望能帮到你O(∩_∩)O哈哈~1)过滤(2)Al2O3；Al2O3和Fe2O3；Fe2O3；K2SO4和(NH4)2SO4 (3)①Al2O3+2NaOH = 2NaAlO2+H2O；②Al3++3NH3·H2O = Al(OH)3↓+3NH4+；③NaAlO2+HCl+H2O = Al(OH)3↓+NaCl；④Al(OH)3 =Al2O3+3H20
