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The cell reaction when a car battery releases energy is given by the equation below - VCE - SSCE Chemistry - Question 8 - 2003 - Paper 1

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The cell reaction when a car battery releases energy is given by the equation below. Pb(s) + PbO2(s) + 4H+(aq) + 2SO4^2-(aq) → 2PbSO4(s) + 2H2O(l) When the battery... show full transcript

Worked Solution & Example Answer:The cell reaction when a car battery releases energy is given by the equation below - VCE - SSCE Chemistry - Question 8 - 2003 - Paper 1

Step 1

When the battery is being recharged, the reaction that occurs at the negative electrode is:

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Answer

The correct reaction at the negative electrode during the recharging of a lead-acid battery is represented by option C. During recharging, lead(II) sulfate reacts with electrons to produce lead and sulfuric acid. The balanced reaction can be written as:

extPbSO4(s)+2e−→extPb(s)+extSO42−(aq) ext{PbSO}_4(s) + 2e− → ext{Pb}(s) + ext{SO}_4^{2−}(aq)

In this process, lead(II) sulfate (extPbSO4 ext{PbSO}_4) is reduced to lead (extPb ext{Pb}), and sulfate ions (extSO42− ext{SO}_4^{2−}) are reformed in the solution.

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