题干

已知:下表为25℃时某些弱酸的电离平衡常数.

CH3COOH

HClO

H2CO3

Ka=1.8×105

Ka=3.0×108

Ka1=4.4×107Ka2=4.7×1011

右图表示常温下,稀释CH3COOH、HClO两种酸的稀溶液时,溶液pH随加水量的变化.下列说法正确的是(   )

A:相同浓度的CH3COONa和NaClO的混合溶液中,各离子浓度的大小关系是:c(Na+)>c(ClO)>c(CH3COO)>c(OH)>c(H+

B:向NaClO溶液中通入少量二氧化碳的离子方程式为:ClO+CO2+H2O=HClO+CO 32

C:图象中a、c两点处的溶液中 c(R)c(HR)(OH) 相等(HR代表CH3COOH或HClO)

D:图象中a点酸的总浓度大于b点酸的总浓度

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答案(点此获取答案解析)

C

同类题5

阅读下面的短文, 根据其内容写一篇60词左右的内容概要。

    Recently, a professor of philosophy in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our day-to-day life has more meaning than we usually think. One of the things he asks his students to do is to keep a record of every penny they spend for a week. From the way they spend their money, they often see what they really value in life.

    He says our relation with others often becomes clearly defined when money enters the picture. You might have wonderful friendship with somebody and you think that you are very good friends. But you will know him only when you ask him to lend you some money. If he does, it brings something to the relationship that seems stronger than ever before. Or it can suddenly weaken the relationship if he doesn't. This person may say that he has a certain feeling, but if it is not carried out in the money world, there is something less real about it.

    Since money is so important to us, we consider those who possess a lot of it to be very important. The author interviewed some millionaires in researching his book.

    Answer: The most surprising thing is why people give me so much respect. I am nothing. I don't know much. All I am is rich.

    People just have an idea of making more and more money, but what is it for? How much do I need for ant given purposes in my life? In his book, the professor uncovered an important need in modern society: to bring back the idea that money is an instrument rather than the end. Money plays an important role in the material world, but expecting money to give happiness may be missing the meaning of life.