
Electrolysis of dilute sodium chloride solution Electrolysis of concentrated sodium chloride solution At anode : Anions : OH- and Cl- OH- ions are selectively discharge according to the position of ions in the Electrochemical Series, ES. Gas bubbles are formed which lighted up a glowing wooden splinter. This gas is oxygen. 4OH- ---> 2 H2O + O2 + 4e At anode : Anions : OH- and Cl- Cl- ions are discharged instead of OH- because of their higher concentration in the electrolyte. A greenish-yellow gas with a pungent and choking smell is released. The gas turns the blue litmus paper red and then white. 2Cl- ---> Cl2 +...