当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破3电解原理应用

【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破3电解原理应用

  • 2026-03-17 14:51:35
【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破3电解原理应用

1.电解池模型

2.对比掌握电解规律(阳极为惰性电极)

电解类型

电解质实例

溶液复原物质

电解水

NaOH、H2SO4或Na2SO4

电解电解质

HCl或CuCl2

原电解质

放氢生碱

NaCl

HCl气体

放氧生酸

CuSO4或AgNO3

CuO或Ag2O

注意电解后有关电解质溶液恢复原态的问题应该用质量守恒法分析。一般是加入阳极产物和阴极产物的化合物,但也有特殊情况,如用惰性电极电解CuSO4溶液,Cu2+完全放电之前,可加入CuOCuCO3复原,而Cu2+完全放电之后,溶液中H+继续放电,应加入Cu(OH)2Cu2(OH)2CO3复原。

3.电解原理的基本应用

(1)电解饱和食盐水(氯碱工业)

阳极反应式:2Cl--2e-===Cl2(氧化反应)。

阴极反应式:2H2O+2e-===H2+2OH-

总反应方程式:2NaCl+2H2O2NaOH+H2+Cl2

(2)电解精炼铜

电极材料:阳极为粗铜,阴极为纯铜。

电解质溶液:含Cu2+的盐溶液。

阳极反应:Zn-2e-===Zn2+、Fe-2e-===Fe2+、Ni-2e-===Ni2+、Cu-2e-===Cu2+

阴极反应:Cu2++2e-===Cu。

阳极泥的形成:在电解过程中,活动性位于铜之后的银、金等杂质,难以在阳极失去电子变成阳离子而溶解,它们以金属单质的形式沉积在电解槽底部,形成阳极泥。

(3)电镀:如图为金属表面镀银的工作示意图。镀件作阴极,镀层金属银作阳极。电解质溶液是AgNO3等含镀层金属阳离子的盐溶液。

电极反应:阳极Ag-e-===Ag+;阴极Ag++e-===Ag。

特点:阳极溶解,阴极沉积,电镀液的浓度不变。

1.(2024·广东,16)一种基于氯碱工艺的新型电解池(如图),可用于湿法冶铁的研究。电解过程中,下列说法不正确的是(  )

A.阳极反应:2Cl--2e-===Cl2

B.阴极区溶液中OH-浓度逐渐升高

C.理论上每消耗1 mol Fe2O3,阳极室溶液减少213 g

D.理论上每消耗1 mol Fe2O3,阴极室物质最多增加138 g

答案 C

解析左侧电极为阴极,发生还原反应,Fe2O3在碱性条件下转化为Fe,电极反应为Fe2O3+6e-+3H2O===2Fe+6OH-,右侧电极为阳极,溶液为饱和食盐水,Cl-放电产生氯气,电极反应为2Cl--2e-===Cl2,中间为阳离子交换膜,Na+由阳极向阴极移动,AB正确;理论上每消耗1molFe2O3,转移6mol电子,产生3molCl2,同时有6molNa+由阳极转移至阴极,则阳极室溶液减少3×71g+6×23g=351g,阴极室物质最多增加6×23g=138g,C错误、D正确。

2.(2023·广东,13)利用活性石墨电极电解饱和食盐水,进行如图所示实验。闭合K1,一段时间后(  )

A.U形管两侧均有气泡冒出,分别是Cl2和O2

B.a处布条褪色,说明Cl2具有漂白性

C.b处出现蓝色,说明还原性:Cl->I-

D.断开K1,立刻闭合K2,电流表发生偏转

答案 D

解析根据题图分析,U形管两侧均有气泡冒出,分别是Cl2H2,A错误;左侧生成氯气,氯气遇水生成HClO,具有漂白性,B错误;b处出现蓝色,发生反应:Cl2+2KI===I2+2KCl,说明还原性:错误;断开K1,立刻闭合K2,此时构成氢氯燃料电池,形成电流,电流表发生偏转,D正确。

3.(2022·广东,10)以熔融盐为电解液,以含Cu、Mg和Si等的铝合金废料为阳极进行电解,实现Al的再生。该过程中(  )

A.阴极发生的反应为Mg-2e-===Mg2+

B.阴极上Al被氧化

C.在电解槽底部产生含Cu的阳极泥

D.阳极和阴极的质量变化相等

答案 C

解析该题中以熔融盐为电解液,以含CuMgSi等的铝合金废料为阳极进行电解,通过控制一定的条件,可使阳极区MgAl发生失电子的氧化反应,分别生成Mg2+Al3+,CuSi不参与反应,阴极区Al3+得电子生成Al单质,从而实现Al的再生,AB错误;阳极材料中CuSi不参与氧化反应,在电解槽底部可形成阳极泥,C正确;因为阳极除了铝参与电子转移,镁也参与了电子转移,且还会形成阳极泥,而阴极只有铝离子得电子生成铝单质,根据得失电子守恒及元素守恒可知,阳极与阴极的质量变化不相等,D错误。

4.(2023·广东,16)用一种具有卯榫结构的双极膜组装电解池(下图),可实现大电流催化电解KNO3溶液制氨。工作时,H2O在双极膜界面处被催化解离成H+和OH-,有利于电解反应顺利进行。下列说法不正确的是(  )

A.电解总反应:KNO3+3H2O===NH3·H2O+2O2+KOH

通过网盘分享的文件:word讲义【更新联系:lymsummers】等2个文件

链接: https://pan.baidu.com/s/1VcNxeHXgbJfoVMtA3SnQAg?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.000835s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001403s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000706s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000697s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001352s ]
  6. SELECT * FROM `set` [ RunTime:0.000580s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001495s ]
  8. SELECT * FROM `article` WHERE `id` = 462564 LIMIT 1 [ RunTime:0.001347s ]
  9. UPDATE `article` SET `lasttime` = 1774753072 WHERE `id` = 462564 [ RunTime:0.007530s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000628s ]
  11. SELECT * FROM `article` WHERE `id` < 462564 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001204s ]
  12. SELECT * FROM `article` WHERE `id` > 462564 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001057s ]
  13. SELECT * FROM `article` WHERE `id` < 462564 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001754s ]
  14. SELECT * FROM `article` WHERE `id` < 462564 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002677s ]
  15. SELECT * FROM `article` WHERE `id` < 462564 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001671s ]
0.117129s