一点重要发现

Date:  2011/8/28   Sort:  化学及实验 9328 Views / 6 Comments 

  今日实验,有几点发现,想分享一下:

  1、蒸干乙酸钠溶液后,像固体中加少许乙醇,点燃,可以发现能燃烧很长时间。通过观察,发现白色固体中有一部分变黑,猜测可能有一部分乙酸钠被燃烧。冷却后滴加稀硫酸,发现产生气泡,且量很大,检验后发现是二氧化碳。这说明,在乙醇灼烧过程中,乙酸根可能几乎全部挥发或被燃烧,取而代之的是碳酸根;

  2、欲点解溴化钠溶液得到溴单质,但发现在酸性环境下反而得不到溴,而调pH为碱性后,产生类似深红色泡沫。尚不清楚是否为溴,但闻气味应该没错。另:点解液中有少量过氧化氢。

  大家可以帮忙分析探究一下。

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2019-05-22 06:56
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