Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

A lead storage battery consists of anode of lead, cathode of a grid of lead packed with lead dioxide (PbO₂) and 38% solution of sulphuric acid as electrolyte. When the battery is in use, the following reactions take place :

On charging the battery, the reverse reaction takes place, i.e., PbSO₄ deposited on the electrodes is converted back into Pb and PbO₂ and H2SO₄ is regenerated.

Reverse of reaction (i) will be reduction and hence will take place at cathode. Reverse of reaction (ii) will be oxidation and hence will take place at anode.