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1，低价态的还原性： 4Fe(OH)2+O2+2H2O===4Fe(OH)3 2NaOH+SO2(少量)===Na2SO3+H2O NaOH+SO2(足量)===NaHSO3 1，与酸性物质的作用： 2NaOH+SiO2===NaSiO3+H2O 2NaOH+Al2O3===2NaAlO2+H2O 2NaOH+Cl2===NaCl+NaClO+H2O NaOH+HCl===NaCl+H2O NaOH+H2S(足量)===NaHS+H2O 2NaOH+H2S(少量)===Na2S+2H2O 3NaOH+AlCl3===Al(OH)3+3NaCl NaOH+Al(OH)3===NaAlO2+2H2O (AlCl3和Al(OH)3哪个酸性强?) NaOH+NH4Cl===NaCl+NH3+H2O Mg(OH)2+2NH4Cl===MgCl2+2NH3.H2O Al(OH)3+NH4Cl不溶解 3,不稳定性:Mg(OH)2===MgO+H2O 2Al(OH)3===Al2O3+3H2O 2Fe(OH)3===Fe2O3+3H2O Cu(OH)2===CuO+H2O | 
