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2. s-Block Elements eLearn.Punjab

In the electrolytic cell, the large block of graphite at the centre is the anode,
above which there is a dome for the collection of chlorine. The cathode is a
circular bar of copper or iron which surrounds the anode but is separated
from it by an iron screen, which terminated in a gauze. The arrangement
permits the electric current to pass freely but prevents sodium and
chlorine from mixing after they have been set free at the electrodes, Fig. 2.1

Molten
Nacl

Fig.2.1 Down’s Cell

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