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CBSE Class 12-science Answered

Write the cell reactions which occur in lead storage battery (i) when the battery is in use (ii) when the battery is on charging.

Asked by Topperlearning User | 22 Jun, 2016, 02:58: PM
Expert Answer
At Anode : Pb (s) + SO4 2- (aq)     PbSO4 (s)+ 2e-.
 At Cathode: PbO2(s) + SO4 2- (aq) + 4H+ (aq) +2e- PbSO4 (s) + 2H2O(l)
The overall reaction is
Pb (s) + PbO2(s) + 4H+ (aq)  + 2SO4 2-(aq)  2PbSO4 (s) + 2H2O(l)
While charging:
At Cathode:      PbSO4 (s)+ 2e-   Pb (s) + SO4 2- (aq)   
 At Anode:   PbSO4 (s) + 2H2O(l)       PbO2(s) + SO4 2- (aq) + 4H+ (aq) +2e-
Answered by | 22 Jun, 2016, 04:58: PM
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