下列是实验室制取气体的发生和收集装置(1)实验室用过氧化氢制取收集氧气装置可选择______,化学方程式

2025-03-15 06:08:21
推荐回答(1个)
回答1:

(1)实验室用过氧化氢制取氧气时,为使反应平稳进行则须控制反应物的量,分液漏斗可逐滴滴加液体,从而达到控制反应速率的目的,使反应平稳进行;氧气不易溶于水,所以收集氧气用排水法或向上排空气法;故填:bd或be;2H2O2
 MnO2 
 
2H2O+O2↑;
(2)用高锰酸钾制氧气时试管口放一团棉花,其作用是防止高锰酸钾粉末进入导管.
故答案为:防止高锰酸钾粉末进入导管.
(3)由于氧气比水的密度小.所以收集的气体在水的上部,利用氧气的压力将水排出;氧气的密度比空气大,所以应从长管进气;故填:A;B;
(4)b装置适用于固液常温下来制取气体,可用碳酸钙和稀盐酸来制取二氧化碳;故填:二氧化碳;
(5)由质量守恒定律可知m(O2)=40g-36.8g=3.2g;
设参加反应的KMnO4质量为x,反应生成的K2MnO4质量为y、MnO2质量分别为z.
2KMnO4
  △  
 
K2MnO4 +MnO2 +O2
316        197   87   32
 x          y    z    3.2g
316
32
x
3.2g
   x=31.6g
 
197
32
y
3.2g
  y=19.7g
87
32
z
3.2g
   z=8.7g
则反应后,试管中剩余的固体物质中含有(40g-31.6g)=8.4g高锰酸钾、19.7g锰酸钾和8.7g二氧化锰.
故答案为:31.6g高锰酸钾分解;反应后试管内有高锰酸钾、锰酸钾和二氧化锰.

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