Q. 484.0( 1 Vote )

Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?

Answer :

The cell reaction of lead storage battery when it is discharged is give below:


At anode: Pb(s) + SO42–(aq) PbSO4 (s) + 2e


At cathode: PbO2(s)+ SO42–(aq)+4H+(aq) +2ePbSO4(s)+2H2O (l)


Overall reaction:


Pb(s)+PbO2(s)+2H2SO4(aq) 2PbSO4(s) + 2H2O(l)


The density is high when the concentration of H2SO4 is high, but during discharge this sulphuric acid gets consumed and becomes diluted with water. So, density decreases as the product water form dilute the H2SO4 concentration during the discharge of the battery.


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