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(1)在小烧杯中加入20mL______,加热到沸腾后,向其中滴入几滴饱和FeCl3溶液,继续煮沸至溶液呈红褐色,即制得Fe(OH)3胶体.
(2)取另一小烧杯也加入20mL蒸馏水后,向烧杯中加入1mLFeCl3溶液,振荡均匀后,将此烧杯(编号甲)与盛有上述操作(1)中制取的物质的烧杯(编号乙)一起放置暗处:分别用激光笔照射两烧杯中的液体,可以看到______(填“甲”或“乙”)烧杯中的液体会产生______效应.这个实验可以用区别溶液和胶体.
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