当前位置:首页>学习笔记>【26版化学人教版选择性必修一学习笔记第四章 第二节 第2课时电解原理的应用

【26版化学人教版选择性必修一学习笔记第四章 第二节 第2课时电解原理的应用

  • 2026-02-12 10:30:21
【26版化学人教版选择性必修一学习笔记第四章 第二节 第2课时电解原理的应用

第2课时 电解原理的应用

[核心素养发展目标] 1.认识电解原理在氯碱工业、电镀及电冶金等工业生产中的实际应用。2.深化对电解原理的理解。

一、电解饱和食盐水——氯碱工业

1.氯碱工业的概念

烧碱、氯气都是重要的化工原料,习惯上把____________________的工业生产叫做氯碱工业。

2.电解饱和食盐水的原理(用惰性电极电解)

通电前:溶液中的离子有_____________________________________________________。

通电后:移向阳极的离子是_________________________________________________,在阳极放电的离子是________。

阳极电极反应:_________________________(________反应)。

移向阴极的离子是________________,在阴极放电的离子是________。

阴极电极反应:________________________ (________反应)。

总反应:

化学方程式:___________________________________________________________________;

离子方程式:___________________________________________________________________。

3.氯碱工业生产流程

工业生产中,电解饱和食盐水的反应在离子交换膜电解槽中进行。

(1)阳离子交换膜电解槽

(2)阳离子交换膜的作用:_____________________________________________________,阻止________________________________________________________________________。

(3)阴极室一般是加入含少量NaOH的水,目的是________________。

4.氯碱工业产品及其应用

(1)氯碱工业产品主要有________、________、________、________、______________等。

(2)以电解饱和食盐水为原理的氯碱工业产品在有机合成、造纸、玻璃、肥皂、纺织、印染、农药、金属冶炼等领域中广泛应用。

(1)电解饱和食盐水时,阴极发生氧化反应:2Cl-2e===Cl2(  )

(2)氯碱工业电解槽中滴入酚酞溶液,变红色的区域为阳极区(  )

(3)电解饱和食盐水时,阳极和阴极都可以选择金属材料(如铁)(  )

(4)电解饱和NaCl溶液可以制取金属钠(  )

1.(2023·浙江6月选考,13)氯碱工业能耗大,通过如图改进的设计可大幅度降低能耗,下列说法不正确的是(  )

A.电极A接电源正极,发生氧化反应

B.电极B的电极反应式为:2H2O+2e===H2+2OH

C.应选用阳离子交换膜,在右室获得浓度较高的NaOH溶液

D.改进设计中通过提高电极B上反应物的氧化性来降低电解电压,减少能耗

2.84消毒液是环境消毒液之一。某学生想制作一种家用环保型消毒液发生器,用石墨作电极电解饱和食盐水,通电时,为使Cl2被完全吸收制得有较强杀菌能力的消毒液,设计了如图所示的装置。c、d都为石墨电极。

完成下列填空:

(1)a为电源的________(填”“”“,下同)极,c为电解池的________极。

(2)d电极的电极反应式:_________________________________________________________,电解产生消毒液的总化学方程式为_________________________________________________。

3. 工业上常利用如图装置电解制备LiOH,两电极区电解液分别为LiOH和LiCl溶液。电极B区电解液为____________(填化学式)溶液,阳极电极反应式为_________________________,电解过程中Li向电极________(填AB)迁移。

二、电镀 电解精炼

1.电镀

(1)电镀:利用________原理在某些金属表面镀上一薄层其他________或________的加工工艺。

(2)目的:使金属增强抗腐蚀能力,增加表面硬度和美观。

(3)电镀池的构成(在铁制钥匙上面镀铜):

阳极材料:镀层金属________,电极反应:Cu-2e===Cu2+

阴极材料:镀件________,电极反应:Cu2++2e===Cu。

电解质溶液:Cu2+浓度________。

2.电解精炼(粗铜含锌、银、金等杂质)

阳极材料:________,电极反应:Zn-2e===Zn2+、Cu-2e===Cu2+

阴极材料:________,电极反应:Cu2++2e===Cu;

电解质溶液:Cu2+浓度________,金、银等金属沉积形成阳极泥。

(1)在Fe上电镀Zn,应用Zn作阳极,用ZnSO4溶液作电镀液(  )

(2)电解精炼铜时,粗铜作阳极,活泼性比Cu弱的杂质金属成为阳极泥沉在阳极区(  )

(3)电解精炼铜时,电解质溶液的成分不发生变化(  )

(4)电镀过程相当于金属的迁移,属于物理变化(  )

1.金属镍有广泛的用途。粗镍中含有少量Fe、Zn、Cu、Pt等杂质,可用电解法制备高纯度的镍,思考回答下列问题:

(1)阳极发生________反应,其电极反应式:

________________________________________________________________________。

(2)电解过程中,阳极减少的质量与阴极增加的质量________(填相等不相等)。

(3)电解后,溶液中存在的金属阳离子有________、________、Ni2+等。

(4)电解后,电解槽底部含有________等金属。

2.利用电解法制备超细银粉的示意图如下,Ag2SO4­H2SO4电解液中添加Ti3+/Ti4+,解决了高电流密度下阴极发生析氢反应的问题,并实现Ti3+/Ti4+循环利用。请结合化学用语解释阴极区附近生成超细银粉的原因:___________________________________________________。

3.[2023·湖南,17(2)]电解精炼装置如图所示(以粗Ga为原料制高纯Ga),电解池温度控制在40~45 的原因是_____________________________________________________,阴极的电极反应式为_________________________________________________________________。

已知:金属Ga的化学性质和Al相似,Ga的熔点为29.8 

三、电冶金

1.电冶金的原理

金属冶炼的本质就是使矿石中的________获得电子变成________的过程:Mnne===M。

2.常用电解法制备的金属

电解法用于冶炼较活泼的金属,如________________等。 

3.实例分析——冶炼金属钠

(1)电解熔融NaCl装置示意图

阴极环绕在阳极外面,两极之间用隔膜D隔开。

(2)电解时的反应

阳极:________________________________________________________________________;

阴极:________________________________________________________________________;

总反应:________________________________________________________________________。

(1)活泼的金属往往采用电解法冶炼(  )

(2)工业上常用钠与熔融的氯化镁反应制取金属镁(  )

(3)工业冶炼金属铝时,电解熔融态AlCl3(  )

(4)电解熔融NaOH的化学方程式:4NaOH(熔融)电解,4Na+2O2+2H2(  )

(5)电解碱土金属氧化物和汞的混合物时,汞齐(汞合金)能保护金属(  )

(6)冶炼钠和镁的阳极电极反应式均为2Cl-2e===Cl2(  )

1.金属镁的工业制备是电解熔融________(填MgCl2MgO),原因是____________。

2.如图为工业电解熔融氧化铝冶炼铝的装置示意图。

(1)写出电解时的电极反应式及总反应方程式。

__________________________________________________________

通过网盘分享的文件:同步PPT课件等3个文件

链接: https://pan.baidu.com/s/1WiBBQCVHpFgaci5JN4S3LA?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000573s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000923s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000329s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000571s ]
  8. SELECT * FROM `article` WHERE `id` = 467904 LIMIT 1 [ RunTime:0.000419s ]
  9. UPDATE `article` SET `lasttime` = 1770979611 WHERE `id` = 467904 [ RunTime:0.009209s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 467904 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001987s ]
  12. SELECT * FROM `article` WHERE `id` > 467904 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000408s ]
  13. SELECT * FROM `article` WHERE `id` < 467904 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003510s ]
  14. SELECT * FROM `article` WHERE `id` < 467904 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006840s ]
  15. SELECT * FROM `article` WHERE `id` < 467904 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014413s ]
0.108368s