Lead Storage Battery

Question

During discharge of a lead storage battery, both electrodes are converted to:

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1. **Anode reaction**: $Pb(s) + SO_4^{2-} 	o PbSO_4(s) + 2e^-$.
2. **Cathode reaction**: $PbO_2(s) + SO_4^{2-} + 4H^+ + 2e^- 	o PbSO_4(s) + 2H_2O$.
3. **Observation**: Both the Lead plate and the Lead Dioxide plate react with Sulfuric acid to form **Lead(II) Sulfate ($PbSO_4$)**.
4. **Electrolyte Effect**: In the process, Sulfuric acid is consumed ($S$ is removed to form sulfate precipitates), leading to a **decrease in the density** of the acid which can be used to check battery charge status.

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Lead Storage Battery

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