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【简答题】
某化学实验小组在实验室中对一烧杯浑浊的河水进行了简单净化．请回答下列有关问题先向烧杯中加入适量明矾粉末．这是利用明矾溶于水后生成的胶状物对杂质的吸附，使悬浮于水中的杂质沉降来达到净水的目的． （1）再进行过滤液体． ①过滤操作所必需的仪器： __________ ； A．烧杯；B．酒精灯；C．铁架台（带）；D．试管；E．玻璃棒；F．漏斗；G．托盘天平；H．蒸发皿 ②玻璃棒的作用是 _______ ； （2）然后用活性炭除去水中的异味．这是利用了活性炭的 ______ 作用． （3）最后进行蒸馏． ①蒸馏时加入沸石的目的是 ______ ； ②所得蒸馏水是 _______ （填“硬水”或“软水”），可以用 ________ 检验来检验．
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