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Question
Answer the following in brief.
Why do the cell potential of lead accumulators decrease when it generates electricity? How the cell potential can be increased?
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Solution
- The cell potential depends on sulphuric acid concentration (density). As the cell operates to generate current, H2SO4 is consumed. Its concentration (density) decreases and the cell potential is decreased.
- During the recharging process by applying external potential slightly greater than 2 V, H2SO4 is regenerated. As a result, its concentration (density) increases and in turn, the cell potential increases.
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