The cell diagram of the process is:
Pb(s) l PbSO4(s) l H2SO4(aq) l PbO2(s), PbSO4(s) l Pb(s) (nonreactive)
The left-hand Pb(s) is one plate
PbSO4(s) is a solid in the left-hand plate
H2SO4(aq) is the electrolyte
PbO2(s), PbSO4(s) is a mixture of solids covering the right-hand plate
Pb(s) is the non-reactive right-hand plate
Because the right-hand cell is covered in a mixture (and hence, is non-reactive), we consider PbO2(s) as the right-hand plate.
The cell diagram for the lead-acid cell that is used in automobile and truck batteries is
Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s)
where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the right-hand lead electrode is nonreactive.
a, Write a balanced equation for the net cell reaction:
b. Look up standard potentials for the oxidation and the reduction reactions, then calculate the value of E°cell.
c. Calculate the value of ΔG°rxn
d. Calculate the value of Ecell at 25°C is [H2SO4] = 10.0M
e. How many lead-acid cells are in a 12 V car battery? Round to the nearest integer.
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