সুখবর হচ্ছে বাংলাদেশই তৈরি হচ্ছে করোনাভাইরাসের প্রতিষেধক অ্যাভিগান

Electrolysis of dilute sodium chloride solution

Electrolysis of concentrated sodium chloride solution
 
At
anode :
 
 
 
 
 
 
 
 
 
 
 


Anions :  OH-   and   Cl-
 

OH- ions are selectively discharge according to the position of ions in the Electrochemical Series, ES.
 

Gas bubbles are formed which lighted up a glowing wooden splinter. This gas is oxygen.
 

4OH- ---> 2 H2O  +  O2   +  4e
 


At
anode :
 
 
 
 
 
 
 
 
 
 
 


Anions :  OH-   and   Cl-
 

Cl- ions are discharged instead of OH- because of their higher concentration in the electrolyte.
 

A greenish-yellow gas with a pungent and choking smell is released. The gas turns the blue litmus paper red and then white.
 

2Cl-  --->  Cl2    +     2e
 
 
At cathode:

Cations :  H+   dan   Na+
 

H+ ions are selectively discharge according to the position of ions in the ES.
 

Gas bubbles are formed. When a lighted wooden splinter is placed near the mouth of   the test tube, a ‘pop’ sound is produced.  Hydrogen gas is produced
 

        2H+   +   2e ---> H2
      

At cathode:

Cations :  H+   dan   K+
 

H+ ions are selectively discharge according to the position of ions in the ES.
 

Gas bubbles are formed. When a lighted wooden splinter is placed near the mouth of the test tube, a ‘pop’ sound is produced.  Hydrogen gas is produced
 

    2H+   +   2e ---> H2