Applications of Electrolysis

Applications of Electrolysis

Electrolysis has wide applications in industries. Some of the important applications are, as follows,
(i) Production of hydrogen by electrolysis of water.

(ii) Manufacture of heavy water .
(iii) The metals like K, Mg, Al, etc., are obtained by electrolysis of fused electrolytes.
(iv) Non-metals like hydrogen, fluorine, chlorine are obtained by electrolysis.
(v) In this method pure metal is deposited at cathode from a solution containing the metal ions etc.
(vi) Compounds like NaOH, KOH, white lead, etc. are synthesised by electrosynthesis method.
(vii) Electroplating: The process of coating an inferior metal with a superior metal by electrolysis is known as electroplating.

The aim of electroplating is, to prevent the inferior metal from corrosion and to make it more attractive in appearance. The object to be plated is made the cathode of an electrolytic cell that contains a solution of ions of the metal to be deposited. 

For electroplatingAnode
Cathode

Electrolyte

With copperCuObject
With silverAgObject
With nickelNiObjectNickel ammonium sulphate
With goldAuObject
With zincZnIron objects
With tinSnIron objects

Thickness of coated layer: Let the dimensions of metal sheet to be coated be 
Thickness of coated layer 
Volume of coated layer
Mass of the deposited substance  

 

Using above relation we may calculate the thickness of coated layer.            
For anions : 

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