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【简答题】
（12分）1,2－二溴乙烷可做抗爆剂的添加剂，常温下为无色液体，密度为2.18g cm － 3 ，沸点131.4℃，熔点9.79℃，难溶于水，易溶于醇，醚，丙酮等有机溶剂。在实验室中可用如下图所示设备制备1,2－二溴乙烷。图中分液漏斗和烧瓶a中装有乙醇和浓硫酸的混合液，试管d中装有液溴（表面覆盖少量水），据此请回答下列问题： （1）写出制备1,2—二溴乙烷的两个反应方程式： ______________________________________、 。 （2）b可以防止倒吸，并用于检查实验进行时试管d是否发生堵塞，请写出发生堵塞时b的现象：_________________________________________。 （3）容器c中NaOH溶液的作用是： __________________________________。 （4）某学生在做此实验时，使用一定量的液溴，当溴全部褪色时，所消耗乙醇和浓硫酸混合液的量，比正常情况下超出很多。如果装置的气密性没有问题，试分析其可能的原因 。 （5）e装置内NaOH溶液的作用是：__________________________________。
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