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鉴定氯离子时为什么先加入稀硝酸
更新时间: 2020-08-17 00:00:00  

鉴定氯离子时先加入稀硝酸的原因是:排除磷酸根离子、碳酸根离子、亚硫酸根离子之类的离子对实验的干扰,因这类离子和钡离子结合会生成沉淀但溶于稀硝酸。氯化银沉淀不溶于稀硝酸。

鉴定氯离子的方法:先加入稀硝酸溶液,再加入硝酸银溶液,产生白色沉淀。

关键词: 鉴定 离子 为什么 加入 硝酸

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