• If the liberated mass doesn’t react with electrodes, the electrode is called inert otherwise soluble.
  • Cu – anode with any metallic cathode in Cu –voltameter forms inert electrode.
  • Platinum electrodes in water voltameter, Platinum anode in Cu – voltameter are the examples of inert electrodes.
  • During electrolysis mass of cathode increases, (Reduction takes place at cathode) while that of anode decreases & concentration of electrolyte remains constant.
  • Alternating current can’t be used in electrolysis. As the frequency of AC changes periodically, so there will be no deposition on any electrode actually.
  • The back EMF or polarization EMF in water is 1.5 V. This is why to carry out electrolysis of H2O we need a voltage greater than 1.5 V.
  • Electrolysis is useful in, electroplating, extraction of metals from ores & their purification, electrolytic etching to mark logo, to produce H2 and O2 commercially, to separate non-metallic particles from the metallic ones, to ascertain the polarity of a battery, in finding equivalent weights & atomic weights.
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