题干

下列实验不能达到预期实验目的是(   )

序号

实验内容

实验目的

A

室温下,用pH试纸测定浓度为0.1mol·L-1NaClO溶液和0.1mol·L-1CH3COONa溶液的pH

比较HClO和CH3COOH的酸性强弱

B

向盛有1mL硝酸银溶液的试管中滴加NaCl溶液,至不再有沉淀生成,再向其中滴加Na2S溶液

说明一种沉淀能转化为另一种溶解度更小的沉淀

C

向含有少量FeCl3的MgCl2溶液中加入足量Mg(OH)2粉末,搅拌一会过滤

除去MgCl2中少量FeCl3

D

室温下,分别向2支试管中加入相同体积、相同浓度的Na2S2O3溶液,再分别加入相同体积不同浓度的稀硫酸

研究浓度对反应速率的影响

A:A   

B:B   

C:C   

D:D

上一题 下一题 0.0难度 选择题 更新时间:2015-06-17 09:03:21

答案(点此获取答案解析)

A

同类题1

请阅读短文,根据短文内容,在下面读书笔记中填入与文章意思最符合的单词,每空一词。

    Everyone wants to find happiness. But sometimes looking for happiness can be as hard as looking for lost treasure. Just when you think you nearly reach it, something unexpected happens. This may trouble you a lot. Here are some tips for helping you find happiness.

    Don't put all your eggs in one basket. If you depend on one thing or one person to make you happy, it may be impossible. You need to have larger circle of friends.

    Follow your heart. When we go against our own thoughts, we usually feel sad. Follow your strong feeling and let it guide you to people and things that will improve your life. Day by day, you will be happier than before.

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    Happiness can be hard to feel at times, so don't think there is something wrong with you if you don't feel it. The ways above will help you to feel more of it.

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