碱1、低价态的还原性：4Fe(OH)2+O2+2H2O===4Fe(OH)32、与酸性物质的作用：2NaOH+SO2(少量)==Na2SO3+H2OOH–+SO2=SO32–+H2ONaOH+SO2(足)==NaHSO3OH-+SO2(足)=HSO3–2NaOH+SiO2==Na2SiO3+H2OOH-+SiO2=SiO32–+H2O2NaOH+Al2O3==2NaAlO2+H2O2OH-+Al2O3=2AlO2–+H2O2KOH+Cl2==KCl+KClO+H2OCl2+2OH–=Cl–+ClO–+H2ONaOH+HCl==NaCl+H2OH++OH =H2ONaOH+H2S(足)==NaHS+H2OOH–+H2S=HS–+H2O2NaOH+H2S(少量)==Na2S+2H2O2OH–+H2S=S2–+2H2O3NaOH+AlCl3==Al(OH)3↓+3NaCl3OH–+Al3+=Al(OH)3↓NaOH+Al(OH)3==NaAlO2+2H2O （AlCl3 和 Al(OH)3 哪个酸性强？）OH–+Al(OH)3=AlO2–+2H2OCa(OH)2+2NH4Cl 2CaCl2+2NH3↑+2H2O (实验室制 NH3)NaOH+NH4Cl NaCl+NH3↑+H2OMg(OH)2+2NH4Cl==MgCl2+2NH3•H2O (Al(OH)3+NH4Cl 不溶解)Ba(OH)2+H2SO4==BaSO4↓+2H2O2H++2OH–+Ba2++SO42–=BaSO4↓2H2O3、不稳定性:Mg(OH)2 MgO+H2O 2Al(OH)3 Al2O3+3H2O2Fe(OH)3 Fe2O3+3H2O Cu(OH)2 CuO+H2O 2AgOH==Ag2O+H2O
