摘要： (1)2Mg +1CO2 ==2MgO+C (2)4Al +3MnO2==3Mn+3Al2O3 3 +3H+ ===Al3++3H2O (4) Al3+ +3 OH- ===Al(OH)3↓ (5) Al3+ + 4OH- ===AlO2-+2H2O (6)1Al3+ +3AlO2-+ 6H2O ==4Al(OH)3↓ △ △ 29. H2 NH4++H2O?NH3·H2O +H+ Mg+2H+=Mg2++H2↑ NH3 NH3·H2O==NH3↑+H2O Mg+2NH4+==Mg2++2NH3↑+H2↑

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