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6电化学中离子交换膜的使用

【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6电化学中离子交换膜的使用

  • 2026-03-21 02:46:11
【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6电化学中离子交换膜的使用

1.交换膜类型及特点

交换膜类型

阳膜

阴膜

双极膜

特定的交换膜

允许通过的离子及移动方向

阳离子移向原电池的正极(电解池的阴极)

阴离子移向原电池的负极(电解池的阳极)

中间层中的H2O解离出H+和OH-,H+移向原电池的正极(电解池的阴极),OH-移向原电池的负极(电解池的阳极)

只允许特定的离子或分子通过,如质子交换膜只允许H+通过,氯离子交换膜只允许Cl-通过

通性

无论是原电池还是电解池中,阳离子均移向得电子的一极,阴离子均移向失电子的一极

2.离子交换膜的作用

3.离子交换膜的判断

判断方法

首先判断隔膜的用途是制取物质还是避免电极产物之间发生反应,然后根据电解质溶液呈电中性的原则判断膜的类型。方法如下:先明确电极产物,写出阴、阳两极上的电极反应式;再依据电极反应式判断该电极附近哪种离子有剩余,结合溶液呈电中性的原则,判断离子移动的方向,确定离子交换膜的类型

锌碘单液流电池,其原理如图所示

分析

负极:Zn-2e-===Zn2+,阳离子浓度增大,为平衡电荷,Cl-移向A区,M为阴离子交换膜;

正极:I2+2e-===2I-,阴离子浓度增大,为平衡电荷,K+移向B区,N为阳离子交换膜

4.多膜电解池方程式的书写及分析

(1)双膜三室处理吸收液(吸收了烟气中的SO2)(或污水)

阳极室

HS-2e-+H2O===S+3H+或S-2e-+H2O===S+2H+

吸收液(或污水)

Na+穿过阳离子交换膜进入阴极室(左室);HS和S穿过阴离子交换膜进入阴极室(右室)

阴极室

2H2O+4e-===2OH-+H2、HS+OH-===S+H2O

产品

阳极室:较浓的硫酸;阴极室:亚硫酸钠

(2)三膜四室制备硼酸[H3BO3(一元弱酸)]

阳极室

2H2O-4e-===O2+4H+

阴极室

2H2O+2e-===H2+2OH-

原料室

[B(OH)4]-穿过阴膜进入产品室,Na+穿过阳膜进入阴极室

产品室

H++[B(OH)4]-===H3BO3+H2O

5.解答含膜电池题的思维模板

(1)第一步:判断装置类型。根据有无外加电源,判断是电解池还是原电池。

(2)第二步:分清隔膜类型。即交换膜属于阳膜、阴膜或质子膜中的哪一种,判断隔膜允许哪种离子通过。

(3)第三步:分析隔膜作用。根据题给信息分析隔膜的作用是平衡电荷,还是让离子选择性通过避免副反应,或为了生成特定物质。

(4)第四步:写出电极反应式。根据电极类型、交换膜两侧离子变化、电荷变化或离子迁移方向等综合信息书写电极反应式,最后做出综合推断或计算。

1.次磷酸钴[Co(H2PO2)2]广泛用于化学镀钴,以金属钴和次磷酸钠为原料,采用四室电渗析槽电解法制备,原理如图:

(1)A是阳离子交换膜,判断方法:根据产物Co(H2PO2)2确定离子移动方向;Co2+向产品室移动,则A是阳离子交换膜

(2)B是阴离子交换膜,判断方法:H2P向产品室移动

(3)Co为阳极,阳极反应式为Co-2e-===Co2+

(4)石墨为阴极,阴极反应式为2H2O+2e-===H2+2OH-,C是阳离子交换膜。

2.(2025·湖南,9)一种电化学处理硝酸盐产氨的工作原理如图所示。下列说法错误的是(  )

A.电解过程中,K+向左室迁移

B.电解过程中,左室中的浓度持续下降

C.用湿润的蓝色石蕊试纸置于b处,试纸先变红后褪色

D.完全转化为NH3的电解总反应:+8Cl-+6H2ONH3+9OH-+4Cl2

答案 B

解析电解池中,阳离子向阴极移动,则K+向左室迁移,A正确;电解过程中,N先生成,再消耗,是中间产物,其浓度增大还是减小,取决于其生成速率与消耗速率,无法得出其浓度持续下降的结论,B错误;b处生成氯气,与水反应生成盐酸和次氯酸,盐酸能使蓝色石蕊试纸变红,次氯酸能使变红的试纸褪

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:0.001433s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001443s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000689s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000669s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001302s ]
  6. SELECT * FROM `set` [ RunTime:0.000592s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001490s ]
  8. SELECT * FROM `article` WHERE `id` = 462622 LIMIT 1 [ RunTime:0.002676s ]
  9. UPDATE `article` SET `lasttime` = 1774758959 WHERE `id` = 462622 [ RunTime:0.001525s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000571s ]
  11. SELECT * FROM `article` WHERE `id` < 462622 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001283s ]
  12. SELECT * FROM `article` WHERE `id` > 462622 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001308s ]
  13. SELECT * FROM `article` WHERE `id` < 462622 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004223s ]
  14. SELECT * FROM `article` WHERE `id` < 462622 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004041s ]
  15. SELECT * FROM `article` WHERE `id` < 462622 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001934s ]
0.190855s