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  • 氨水的沉淀性

    沉淀性

      氨水是很好的沉淀劑,它能與多種金屬離子反應,生成難溶性弱堿或兩性氫氧化物。例如: 

      Al3++3NH3·H2O==Al(OH)3↓+3NH4+ 

      生成的Al(OH)3沉淀微溶于過量氨水。 

      Fe2++2NH3·H2O==Fe(OH)2↓+2NH4+ 

      生成的白色沉淀易被氧化生成紅褐色沉淀 

      4Fe(OH)2+O2+2H2O=4Fe(OH)3(紅褐色) 

      利用此性質,實驗中可制取Al(OH)3、Fe(OH)3、Fe(OH)2(苯層覆蓋)等。


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