Grade 12Physical Chemistry
When aqueous soln of NaCl is eletrolysed using platinum electrodes then ions discharged at electrodes are ?
When aqueous soln of NaCl is eletrolysed using platinum electrodes then ions discharged at electrodes are ?
1 Answer
stenly
Electrolysis of aq.NaCl using Pt/C electrode:
ions present : Na+,H+, OH- ,Cl-
at cathode: Na+,H+ migrate towards cathode, but H+ is discharged in preference to Na+ (lower in electro chemical series)
2H+(aq) +2e- ----> H2(g)
at cathode: Na+,H+ migrate towards cathode, but H+ is discharged in preference to Na+ (lower in electro chemical series)
2H+(aq) +2e- ----> H2(g)
at anode: OH- ,Cl- ions migrate towards the anode. if NaCl solutionis diluted, then OH- ions are discharged in preference to Cl-
4OH-(aq) -----> 2H2O(l)+O2(g)+4e-
4OH-(aq) -----> 2H2O(l)+O2(g)+4e-
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