When does a concentration and galvanic cell end?

[fluoropHore]

How come for a galvanic cell the voltage depletes (cell ends) after most of the reactant has reacted and product has built up? (Unless this is wrong)

and cell ends in a concentration cell (when the individual cells have different concentrations) when the two cells come to equilibrium (ie the two cells have intermediate concentration..or the Same concentration?)

Is this wrong?

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[MrNeuro]

How come for a galvanic cell the voltage depletes (cell ends) after most of the reactant has reacted and product has built up? (Unless this is wrong)

and cell ends in a concentration cell (when the individual cells have different concentrations) when the two cells come to equilibrium (ie the two cells have intermediate concentration..or the Same concentration?)

Is this wrong?

im pretty sure both are dependent upon the Q/Keq ratio

 

[Buttafuoco]

The main driving force of a galvanic cell is the difference in reduction/oxidation potential of the species. If you have electrodes of some metal on either side and the same concentration of ions, no driving force. But if you have different metals with their ions at the same concentration, there is a tug of war for the electrons that results in the one with the higher reduction potential taking the other species' electrons and so there will be less of it in solution.

 

[MedPR]

A galvanic cell will continue until either the cathode is plated out or the anode is completely oxidized (and thus dissolved) so long as the salt bridge is not compromised.