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ICSE Class 9 Answered

Give the construction and working of a lead accumulator along with the chemical reaction involved.
Asked by sumankumar061998 | 22 Feb, 2019, 04:37: PM
answered-by-expert Expert Answer

A Secondary Battery: The Lead Acid Battery - 

 
It is an example of Secondary cell. 
 
The electrodes of the cells in a lead storage battery consist of lead grids. The openings of the anodic grid is filled with spongy (porous) lead. The openings of the cathodic grid is filled with lead dioxide {PbO2}. Dilute sulfuric acid {H2SO4} serves as the electrolyte. When the battery is delivering a current, Pb is oxidised which is the discharging of the cell.
 
Construction -
 
  • Consists of a lead plate which behaves as a -ve electrode
  • lead plate impregnated with lead oxide behaves as +ve electrode.
  • Both these plates are arranged in alternate way.
  • this whole arrangement is dipped into a non conducting vessel ussually of plastic or glass in solution of dillute sulphuric acid.
  • All +ve plates and -ve plates are connected to each other respectively.

Working - 

 While Discharging, the lead at the anode is oxidized:

Pb  → Pb2+ + 2 e–

Because the lead ions are in the presence of aqueous sulfate ions (from the sulfuric acid), insoluble lead sulfate precipitates onto the electrode

the overall reaction is given by -

 Pb + SO42– → PbSO4 (electrode) + 2 e–

the lead ions that are formed react with aqueous sulfate ions to form insoluble lead sulfate on the electrode, and the overall reaction at the cathode is:

  2 e– + PbO2 + 4 H+ + SO42–      → PbSO4 (electrode) + 2 H2O
Answered by Sumit Chakrapani | 23 Feb, 2019, 09:52: AM

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