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酒精脱色为什么要隔水加热同题
更新时间: 2020-08-18 00:00:00  

1、光照几个小时后把叶片放入盛有酒精的烧杯中,隔水加热,使叶片含有的叶绿素溶解到酒精中至叶片变成黄白色,叶绿素为绿色,脱色后便于观察,如不脱色,不易观察到淀粉遇碘变蓝的现象;

2、脱色时,酒精要隔水加热是因为酒精的燃点低,防止酒精燃烧发生危险。

关键词: 酒精 为什么 加热

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