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高二化学课本实验(4-3),是用浓氨水检验甲烷与氯气发生反应,生成氯化氢。但我们将蘸有浓氨水的玻棒伸入纯净氯气中和未照光的甲烷和氯气的混合气体中,均有白烟产生。所以,我们认为用浓氨水来检验此反应进行与否,是不够严格的。我们将该实验作这样的改进。甲烷与氯气的混和气体照光(注意氯气不过量),黄绿色褪去后,用-湿润的KI-淀粉试纸伸入瓶内,无变化,说明
The high school chemistry textbook experiment (4-3) uses concentrated ammonia to test the reaction of methane with chlorine to produce hydrogen chloride. However, we stuck glass rods with concentrated ammonia into pure chlorine gas and a mixture of unlit methane and chlorine, all producing white smoke. Therefore, we believe that using concentrated ammonia to test whether or not this reaction is carried out is not strict enough. We will make such an improvement in this experiment. Mixed gas of methane and chlorine (but not excessive amount of chlorine gas). After yellow-green color fades out, use a moist KI-starch test paper to stick into the bottle. No change.