Industrial Applications of Electrolysis - Extraction of Sodium


  1. Figure above shows the illustration of the designed used to extract sodium in industry by using electrolysis.
  2. In SPM, you need to know
    1. the electrolyte used
    2. the material used as anode and cathode
    3. the chemical reaction at anode and cathode

Electrolyte

Molten sodium chloride

NaCl ---> Na+ + Cl-

Electrode:

Anode: Graphite
Cathode: Iron

Chemical Reaction

Anode:
2Cl- ---> Cl2 + 2e

The negative chloride ions are attracted to the anode and then discharged to form chlorine gas.

Cathode
Na+ + e ---> Na

Note:
  1. The sodium ions are discharged to form sodium atom.
  2. Due to high temperature, the sodium metal formed is in molten form.
  3. Metal sodium have lower density. Therefore it moves upward and been collected.


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