glavanic cell and increasing emf

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pizza1994

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why will increasing the concentration of the oxidant at the cathode increase the emf of a glavanic cell?

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Because you are changing concentrations, we can assume the cell is not under standard conditions (everything at 1M concentrations). Therefore, look to the nernst equation for the new EMF.

Ecell = E0cell - (RT/nF)lnQ

In this case, increasing the concentration of oxidant at the cathode changes the Q value. If you write out the full reaction for the cell, you can determine products and reactants and see how varying concentrations increase or decrease E from its standard value.
 
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Because you are changing concentrations, we can assume the cell is not under standard conditions (everything at 1M concentrations). Therefore, look to the nernst equation for the new EMF.

Ecell = E0cell - (RT/nF)lnQ

In this case, increasing the concentration of oxidant at the cathode changes the Q value. If you write out the full reaction for the cell, you can determine products and reactants and see how varying concentrations increase or decrease E from its standard value.

thanks :)
 
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