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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Elesctrolysis of NaCl(aq)
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[Post New]19 May 2008 19:24:28 IST
    Subject: Elesctrolysis of NaCl(aq)
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djdylan2000 (202)

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Why H2 and Cl2 are liberated at Cathode and Anode respectively instead of H2 and O2 The NCERT textbk says"Due to 'overpotential of oxygen' chlorine is released although Oxygen has a lower E value than Chlorine"


What is 


Overpotential of Oxygen???
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[Post New]19 May 2008 19:50:13 IST
    Subject: Re:Elesctrolysis of NaCl(aq)
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mona840 (717)

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see


in electrolysis of aq NaCl, Cl2 is evolvd at anode bcoz the discharging potential of OH- is greater thn tat of Cl-


so discharging tendency of Cl- is more


O2 will b evovld at anode wen the soln is vry dil.....coz thn the concentration of OH- will b more


 
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[Post New]19 May 2008 19:56:18 IST
    Subject: Elesctrolysis of NaCl(aq)
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nunoxic (1460)

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Check out EMF series

on the bottom (or top depending on what u refer) are elements like Li n Na
these have VERY HIGH OXIDATION POTENTIALS...
i.e they tend to oxidise easily
na > na + is simple
reverse is not
h > h+ or reverse both has 0 V potential
so if u have to carry out a reaction between
Na + > Na
H + > H
check the potentials.....the second is much easier
same goes for Cl-
hence the products obtained are H2 n O2

conduct the same experiment in MOLTEN NaCl u will get what u expect
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