The chemical compounds which conduct electricity and
as a result decompose by the loss and gain of
electrons are called electrolytes. The chemical
compounds which do not conduct electricity are
called non - electrolytes.
Electrolytic cells are the cells, use external
voltage to push a reaction non - spontaneously and
are used to convert electrical energy into chemical
energy while electrolysis may be defined as a
process in which movements of the ions take place
towards their respective electrodes to undergo
chemical changes under the influence of applied
electric field. In the electrolysis of molten sodium
chloride, sodium metal is formed at cathode, while
chlorine gas is liberated at anode.
Electrochemical voltaic cell uses spontaneous
chemical reactions to generate an electric current
through oxidation - reduction,-' reactions. The half
reactions take place in half cells. The half cell in
which reduction occurs is called cathode; the half
cell in which oxidation occurs is called anode.
Electrons flow in the external circuit from anode to
cathode. Voltaic cells are used commercially as
portable energy sources (batteries). Electrolysis is
an important process used for the extraction of
certain metals, in purification of metals and in
electroplating. Nickel - plating and chromium
plating are very important techniques to protect
baser metals from corrosions.