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

Explanation

Chlorine is obtainedby the electrolysis of brine solution. Chlorine is liberated at anode.
Brine solution is taken in a perforated U-shaped steel vessel. Graphite .rod acts as anode, steel vessel acts as cathode. `H_(2)` and NaOH are by products.

`NaCl to Na^(+) +Cl^(-)`
At anoe `2Cl^(-2) 2e to Cl_(2)`
`2H_(2)O+2e to 2OH^(-)+H_(2)`
`Na^(+)+OH to NaOH`
With hot, conc. NaOH, chloride and chlorate are formed.
`6NaOH+3Cl_(2) to 5NaCl +NaClO_(3)+3H_(2)O`
`Ca(OH)_(2)Cl_(2) to CaCl_(2)+H_(2)O`
Bleaching powder is formed.