Question

Write electrode reactions and overall cell reaction when lead accumulator behaves as an electrolytic cell.

Answer 1

Explanation:

Lead storage battery is a secondary cell used in automobiles and invertors. The anode is made up of lead and undergoes oxidation during discharging and cathode is made up of lead oxide and acts as cathode during discharging. The electrolyte used is dilute $H_2SO_4$.

Electrolytic cell is the cell where electrical energy is used to carry about chemical reactions. This happens during charging of lead accumulator.

Charging:

Cathode  : $PbSO_4(s)+2e^{-}\rightarrow Pb+SO_4^{2-}$

Anode: $PbSO_4+2H_2O\rightarrow  PbO_2+SO_4^{2-}+4H^++2e^-$

Overall reaction : $2PbSO_4+2H_2O\rightarrow Pb+PbO_2+2H_2SO_4$

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