先是：Al3+ + 4OH- = AlO2- + 2H2O,然后：Al3+ + 3AlO2- + 6H2O = 4Al(OH)3↓化学方程式啊。。。。AlCl3 + 4NaOH = NaAlO2 + + 3NaCl + 2H2O，AlCl3 + 3NaAlO2 + 6H2O = 4Al(OH)3↓ + 3NaCl