why is sodium discharged at mercury cathode in castner kellner cell
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At the same time the dischargepotential of Na+ ions is lowered, since the sodium atoms combine withmercury to form an amalgam. ... Thesodium released reacts with water to form sodium hydroxide and hydrogen, the mercury being recovered and returned to the electrolysis cell.
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Flowing layer of mercury (Hg) at the bottom of tank serves as cathode. When electric current is passed through brine, +ve and -ve ions migrate towards their respective electrodes. Na+ions are discharged at mercury cathode. The sodium deposited at mercury forms SODIUM AMALGAM.
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