【化学】CO2除了用澄清的石灰水之外还可以用什么方法检验?

2025-03-16 04:45:29
推荐回答(5个)
回答1:

点一支蜡烛,把装有CO2气体得试管用有孔试管塞塞住,利用CO2密度大于空气,用导管将CO2到处,若蜡烛熄灭,则说明该气体是CO2气体。反之,则不为CO2气体.
另外,还可以利用其性质。因为CO2是酸性溶液,将其通入紫色石蕊试液中,同业变红,加热后溶液又变为紫色,则说明该气体是CO2.
检验CO2方法:澄清的石灰水(不严谨)
饱和碳酸钠,是二氧化碳会有晶体析出(碳酸氢钠)
苯酚钠,是二氧化碳溶液会变浑浊(不严谨)

回答2:

严谨,直接通含H2O2的Ca(OH)2溶液(或过酸性KMnO4),要是SO2会直接被氧化成SO42-,这样再出沉淀就应该是CaCO3了。或是通过酸性KMnO4通入石蕊溶液。

回答3:

点一支蜡烛,把装有CO2气体得试管用有孔试管塞塞住,利用CO2密度大于空气,用导管将CO2到处,若蜡烛熄灭,则说明该气体是CO2气体。反之,则不为CO2气体.
另外,还可以利用其性质。因为CO2是酸性溶液,将其通入紫色石蕊试液中,同业变红,加热后溶液又变为紫色,则说明该气体是CO2.

回答4:

用湿润的紫色石蕊试纸or紫色石蕊溶液,通入该气体变红。这个和澄清的石灰水一样区别不了SO2的,不过相对比较严密了吧

回答5:

检验CO2方法:澄清的石灰水(不严谨)
饱和碳酸钠,是二氧化碳会有晶体析出(碳酸氢钠)
苯酚钠,是二氧化碳溶液会变浑浊(不严谨)

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