题干

下表是25℃时某些盐的溶度积常数和弱酸的电离平衡常数,下列说法正确的是(   )

化学式

CH3COOH

H2CO3

AgCl

Ag2CrO4

Ka或Ksp

Ka=1.8×10﹣5

Ka1=4.1×10﹣7

Ka2=5.6×10﹣11

Ksp=1.8×10﹣10

Ksp=2.0×10﹣12

A:常温下,相同浓度①CH3COONH4②NH4HCO3③(NH42CO3溶液中,c(NH4+)由大到小的顺序是:①>②>③

B:向饱和氯水中滴加NaOH 溶液至溶液刚好为中性时,c(Na+)=2c(ClO)+c(HClO)

C:AgCl 易溶于氨水难溶于水,所以AgCl 在氨水中的Ksp 大于水中的 Ksp

D:向浓度均为1×10﹣3mol•L﹣1的KCl 和K2CrO4混合液中滴加1×10﹣3mol•L﹣1 的AgNO3溶液,CrO42先形成沉淀

上一题 下一题 0.0难度 选择题 更新时间:2012-06-26 08:52:37

答案(点此获取答案解析)

B

同类题5

根据首字母提示,拼写单词。

    Sam and Tom were identical(同样的) twins. They were so identical that even their mother found it d____to tell one from the other. But except for their looks, everything else about them was different.

    Tom had no friends, w____Sam was a great friendship maker. Sam loved sweets, but Tom loved spicy food and h____sweets. Sam was generous and selfless, Tom was greedy and selfish!

    As Sam and Tom grew up, their father wanted to s____his fortune equally. However, Tom did not agree, and he argued that whoever proved to be smarter and stronger would have to get a b____share of the wealth.

    Sam agreed. Their father decided to organize a competition b____the two. He asked the two sons to walk as long as they could, and return home before sunset.

    The following day, Sam and Tom set out to walk. It was a rather sunny day. Sam walked slowly and steadily, while Tom ran q____as he aimed at winning the race and gained a greater portion of his father's wealth.

    Sam knew that it would be ideal to walk as far as possible till noon, and start for home at noon, as it would take the same amount of time to walk back home. K____this, Sam decided to turn back for home at noon so as to reach home on time.

    However, Tom, with his greed to earn more w____ didn't try to return home even after mid-noon. He walked twice as long as Sam, and thought he would still be able to return home before sunset. U____ he lost the race at last only because of his greed.