有A、B、C、D、E五种常见化合物,都是由下表中的离子形成的: 阳离

有A、B、C、D、E五种常见化合物,都是由下表中的离子形成的:

阳离子

K+   Na+   Cu2+   Al3+

阴离子

  

     OH-

为了鉴别上述化合物,分别完成以下实验,其结果是:

①将它们溶于水后,D为蓝色溶液,其他均为无色溶液;

②将E溶液滴入到C溶液中出现白色沉淀,继续滴加,沉淀溶解;

③进行焰色反应,只有B、C为紫色(透过蓝色钴玻璃);

④在各溶液中加入硝酸钡溶液,再加过量稀硝酸,A中放出无色气体,C、D中产生白色沉淀;

⑤将B、D两溶液混合,未见沉淀或气体生成。

根据上述实验填空:

(1)写出B、D的化学式:B____________,D____________。

(2)将含1 mol A的溶液与含1 mol E的溶液反应后蒸干,仅得到一种化合物,该化合物为________________。

(3)在A溶液中加入少量澄清石灰水,其离子方程式为

____________________________________________________________________。

(4)C常用作净水剂,用离子方程式表示其净水原理

____________________________________________________________________。

答案

(1)KNO3  CuSO4

(2)Na2CO3(或“碳酸钠”,填“Na2CO3·10H2O”不可)

(3)2+Ca2++2OH-*CaCO3↓++2H2O

(4)Al3++3H2OAl(OH)3+3H+

解析:根据①可知D中阳离子为Cu2+,阴离子可能为,根据②③⑤可知E为NaOH,C为KAl(SO4)2,根据④可知A为NaHCO3,D为CuSO4,则剩余B只能是KNO3.

相关题目

91.You will find as you read fiats book that you just can’t keep some of these
91.You will find as you read fiats book that you just can’t keep some of these stones to ______. You will want to share them with a friend.  A. itself                     B. yo
(+)2dx= . 
(+)2dx= . 
下列各组词语中加点的字,每对的读音都不相同的一组是( 
下列各组词语中加点的字,每对的读音都不相同的一组是(  ) A.朔风/上溯果脯/哺育真谛/取缔 B.惆怅/绸缪      简陋/露面      威名/偎依 C.
Roger Federer and Serena Williams have been named as 2009' s world champions by
Roger Federer and Serena Williams have been named as 2009' s world champions by the International Tennis Federation(ITF) after topping the year-end rankings.          Federer, who wins t
鸦片最早用于药物(有止痛、止泻、止咳的作用),长期服
鸦片最早用于药物(有止痛、止泻、止咳的作用),长期服用会成瘾。现有鸦片的替代品用于脱瘾治疗,结构简式如图所示:。1 mol该化合物与足量的NaO
Included _____. A. all kinds of books            B. was all kinds of b
Included _____. A. all kinds of books            B. was all kinds of books C. were all kinds of books           D. all kinds of books are
—How long have you ______ Jinan?     —For ten years.     A. moved to
—How long have you ______ Jinan?     —For ten years.     A. moved to           B. left for          C. lived in        D. gone to
This was no ordinary class. The students who came together were all science or e
This was no ordinary class. The students who came together were all science or engineering professors at Cornell University. They had interrupted their research to accept an invitation to take part in

最新题目