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Electrochemical Cell notation help

PbSO4 (s) + 2e- ----> Pb (s) + SO4 2- (aq) E= -0.356V

PbO2 (s) + SO4 2- (aq)+ 4H+ + 2e- ----> PbSO4 (s)+ 2H2O (l) E= +1.685 V

Cell diagram: Pb| PbSO4 || PbO2 | PbSO4


why isnt SO42-, H+ or H20 included in the cell diagram?
:bump:
Original post by chem revision
PbSO4 (s) + 2e- ----> Pb (s) + SO4 2- (aq) E= -0.356V

PbO2 (s) + SO4 2- (aq)+ 4H+ + 2e- ----> PbSO4 (s)+ 2H2O (l) E= +1.685 V

Cell diagram: Pb| PbSO4 || PbO2 | PbSO4


why isnt SO42-, H+ or H20 included in the cell diagram?


Well you're going to have to look at the equations and see what's getting oxidised and reduced. The H remains at 1+, S remains at 2+ and oxygen remains at 2-. Pb however changes oxidation state and so it's involved in the equation.
Original post by M0nkey Thunder
Well you're going to have to look at the equations and see what's getting oxidised and reduced. The H remains at 1+, S remains at 2+ and oxygen remains at 2-. Pb however changes oxidation state and so it's involved in the equation.


ok so anything that doesnt get reduced or oxidised is not included in the cell notation?
Original post by chem revision
ok so anything that doesnt get reduced or oxidised is not included in the cell notation?


Well you've sometimes got platinum included for electrical contact. Generally though, that's the idea.
Original post by M0nkey Thunder
Well you've sometimes got platinum included for electrical contact. Generally though, that's the idea.


Cheers mate

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