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Chemistry help?

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2) as a standard voltaic cell runs,  the voltage delivered by the cell drops with time. Why does this happen?
asked Apr 25, 2015 in CHEMISTRY by heather Apprentice

1 Answer

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All the oxidation and reduction reactions takes place in Standard voltaic cell.

Nernst Equation :

Nernst equation is image, where image is the reaction quotient.

As the voltage drop in the cell decreases with time then image reduces, decreasing emf of the cell.

When the oxidizer pulls electrons with a stronger electromotive force, that voltage for a standard cell decreases, reducing the emf.

Hence as the voltage drop by the cell decreases with time, emf of the cell goes down.

answered Apr 25, 2015 by Lucy Mentor
edited Apr 25, 2015 by Lucy

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