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51问答网 > 实验室制氯气的尾气用氢氧化钠吸收,中间要不要连防倒吸装置呢,为什么

实验室制氯气的尾气用氢氧化钠吸收,中间要不要连防倒吸装置呢,为什么

2025-03-14 20:28:53

推荐回答（1个）

回答1：

应该不需要,课本上应该没有用. 因为氯气在水中的溶解(体积比约1:2),或者反应不剧烈,具体是不会瞬间产生体积比超过1:20的现象,而产生负压, 氯气只有与NaOH接触才反应,接触面小. 负压就是倒吸的原因所在.
氯气可以和氢氧化钠做喷泉实验,是因为氯气反应了.体系内压力减小了.所以可以做. 但现象不剧烈.不同于 HCl, NH3, SP2 等溶于水前两者都大于1:500.
但我认为若防一下也算不上多余.

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