The lead-acid storage battery consists of the following two half-cells:
PbO₂(s) + 4 H⁺(aq) + SO^42-(aq) + 2 e–  PbSO₄(s) + 2 H₂O(l)
Pb(s) + SO^42-(aq)  PbSO₄(s) + 2 e–
Which of the following concentrations decrease as the battery is discharged?
I. [H⁺]
II. [Pb²⁺]

Question

The lead-acid storage battery consists of the following  two half-cells:
PbO2(s) + 4 H+(aq) + SO42-(aq) + 2 e–  PbSO4(s) + 2  H2O(l)
Pb(s) + SO42-(aq)  PbSO4(s) + 2 e–
Which of the following  concentrations decrease as the battery is discharged?
I. [H+]
II. [Pb2+]

Accepted Answer

Correct answer: A.

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