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如何去除氯气中的氯化氫？

返回打印发布时间：2022/7/18 点击：14293

如何去除氯气中的氯化氫？

除去氯气中少量的氯化氫气体，可选用饱和食盐水。

原理：氯气难溶于饱和食盐水，但HCl极易溶于水，可用饱和食盐水除去氯气中少量的氯化氫气体HCl在水中溶解度很大,1体积水可以溶解500体积的HCl，Cl2溶于水后发生可逆反应 Cl2+H2O==HCl+HClO

氯气的生产方法经历了漫长的发展过程。1774年瑞典化学家舍勒用软锰矿（含有二氧化锰）和浓盐酸作用，首先制得了氯气，其反应方程式为：

4HCl（浓）+MnO2=加热= MnCl2+2H2O+Cl2↑

然而，由于当时还不能够大量制得盐酸，故这种方法只限于实验室内制取氯气。

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