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Question:

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

Answer:

A lead storage battery consists of a lead anode, a grid of lead packed with lead oxide (PbO2) as the cathode, and a 38% solution of sulphuric acid (H2SO4) as an electrolyte.

When the battery is in use, the following cell reactions take place:

At anode: Pb(s) + SO2-4(aq)  → PbSO4(s) + 2e-

At cathode:

The overall cell reaction is given by,

When a battery is charged, the reverse of all these reactions takes place.

Hence, on charging, present at the anode and cathode is converted into and respectively.


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