A small quantity of solid lead bromide is taken in a silica crucible and two graphite electrodes are inserted. A battery consisting of two dry cells is connected to the electrodes through a switch and an ammeter.
When the crucible containing lead bromide is heated the solid lead (II) bromide melts. Now, on pressing the switch, electricity flows through the system and a red brown gas (bromine) evolves at the anode and metallic lead deposits at the cathode.
Thus, electrolysis of lead bromide using graphite electrodes produces lead metal at the cathode and bromine gas at the anode.
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