Laboratory and industrial preparation of chlorine gas
 
 
 
LABORATORY METHOD
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In laboratory Cl2 gas is prepared by heating a mixture of NaCl , MnO2 with conc. H2SO4.
4NaCl +4H2SO4 +MnO2è 4NaHSO4 +MnCl2+2H2O +Cl2
SECOND METHOD
Chlorine may also be obtained by heating mangenese dioxide with concentrated hydrochloric acid
MnO2 + 4HCl è MnCl2+2H2O +Cl2
INDUSTRIAL PREPARATION
On industrial scale Cl2 is obtained by the electrolysis of aqueous solution of NaCl called Brine.
 
NaCl + H2O è Cl2+H2 + 2NaOH
IONIZATION OF NaCl
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NaCl Na+ + Cl-
REACTION AT ANODE
Cl- ions are collected at anode and form chlorine gas
2Cl-è Cl2+ 2e-
REACTION AT CATHODE
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Na+ ions are collected at cathode where they are mixed with water to produce sodium hydroxide and liberate hydrogen gas.
2Na+ + 2H2O + 2e-è 2NaOH + H2
OVERALL REACTION
2Na+ + 2H2O + 2e-è 2NaOH + H2
2Cl-è Cl2+ 2e-
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2Na+ 2Cl- + 2H2Oè 2NaOH + Cl2 +H2
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