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铵根离子的检验方法

更新时间: 2020-10-28 00:00:00     

加入过量NaOH,加热,有NH4+存在,即放出NH3气体,遇湿润的红色石蕊试纸,试纸变蓝。

NH4++OH-=H2O+NH3(气体)。

注:CN-存在时,加热后也会放出NH3,对此有干扰作用。

CN-+2H2O==加热==HCOO-+NH3(气体)。

关键词: 离子 检验 方法

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