How is chlorine prepared by electrolytic method ? Explain its reaction with
NaOH

Explanation

Preparation of chlorine by electrolytic method : Chlorine is obtained by the electrolysis of brine solutions (Conc. NaCl). `Cl_(2)` gas is liberated at anode.
`2NaCl to2" Na"^(+)+2Cl^(-)`
`2" H"_(2)O+2e^(-)to2OH^(-)+H_(2)` (cathode)
`2" Cl"^(-) to Cl_(2)+2E^(-)` (anode)
i) NaOH :
Chlorine reacts with cold dil. NaOH to from sodium hypochlorite.
`Cl_(2)+2" NaOH"to"NaCl"+"NaOCl"+H_(2)O`
ii) `Cl_(2)` reacts with hot conc. NaOH to form sodium chloride and sodium chlorate.
`3Cl_(2)+6" NaOH"to5" NaCl"+"NaClO"_(3)+3" H"_(2)O`