题干

Fe(OH)3胶体在生活中有重要应用,利用FeCl3和沸水反应制备的Fe(OH)3胶体中常混有FeCl3和HCl.已知胶体不能透过半透膜,而小分子和离子可以透过半透膜.试回答下列有关问题:

(1)实验室制取Fe(OH)3胶体的方法是____ ,用____ 方法除去胶体中的浑浊物;根据____ 现象证明胶体已经制成.

(2)检验溶液中存在Fe3+和H+的方法是____ 

(3)除去胶体中混有的FeCl3和HCl的方法是:____ 

(4)如何用实验的方法证明胶体和Cl已经分离?____ 

(5)鉴别Fe(OH)3胶体和FeCl3溶液最简单的方法是____ 

(6)高铁酸钠(Na2FeO4)的氧化性比KMnO4更强,它是一种备受关注的新型净水剂,请指出Na2FeO4净水的原理,并说明该净水剂有何优越性____ 

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答案(点此获取答案解析)

\u5728\u6cb8\u817e\u7684\u84b8\u998f\u6c34\u4e2d\u6ef4\u52a0\u9971\u548cFeCl3\u6eb6\u6db2\uff0c\u5f85\u6eb6\u6db2\u5448\u7ea2\u8910\u8272\u65f6\uff0c\u505c\u6b62\u52a0\u70ed\uff0c\u5373\u5236\u5f97\u80f6\u4f53,\u8fc7\u6ee4,\u4e01\u8fbe\u

同类题2

阅读短文,完成表格

    Read the passage carefully and complete the table with only one word for each blank.

    Back in the twentieth century, robots seemed to have a big future, at least in the movies. Like the robots servants in the Star War movies. It looked as if one day robots would do all the boring or dangerous jobs while the humans sat around doing something more interesting. But people were also frightened that robots might become the bosses, not the servants.

    Has it happened? You're still unlikely to see a robot walking around your town but that doesn't mean they don't exist. Robots are used in car making, and in areas which are dangerous for humans, in bomb producing and deep-sea discovering, for example. We employ robots instead of doing the job ourselves. According to the report, there are 750,000 working robots in the world today.

    These working robots definitely look like machines but many scientists are now trying to make robots look more similar to humans. So what will robots be able to do by the year 2030? There are already plans to use robots in hospitals and old people's homes. Robot nurses will remind patients to take their medicine or tell a doctor if the patient needs attention. But many people are worried about the idea of robots looking after the old, the sick and the very young, separating them from important human contact. It may also create unemployment. It is really possible that robots will be used for many jobs in areas.

    But can we be sure that the next generation robots will always follow human orders? Or even destroy them? Or will we be able to create robots with emotions? Only the future will tell.

Will robots ____ the world?

The imagination of robots in the past

The images of robots appeared in movies.

Robots were thought to work for people.

People have a____ that robots would become bosses.

The use of robots at present

Robots don't take over the world.

They ____ people in some dangerous areas, from car making to deep-sea discovering.

People's plans and ____ about robots for the future

Robots will be more like humans.

They will be used in more areas, like in the hospital.

It may cause problems, like the ____ of humans from each other and the unemployment.