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```				   Which relation represents the emf of the cell?
```

6 years ago

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```										Dear krishna,
Standard electrode potentials are usually tabulated as reduction  potentials. However, the reactions are reversible and the role of a  particular electrode in a cell depends on the relative  oxidation/reduction potential of both electrodes. The oxidation  potential for a particular electrode is just the negative of the  reduction potential. A standard cell potential can be determined by  looking up the standard electrode potentials for both electrodes  (sometimes called half cell potentials). The one that is smaller will be  the anode and will undergo oxidation. The cell potential is then  calculated as the sum of the reduction potential for the cathode and the  oxidation potential for the anode.
$\mbox{E}^{o}_{cell}=\mbox{E}^{o}_{red}(cathode)-\mbox{E}^{o}_{red}(anode) = \mbox{E}^{o}_{red}(cathode)+\mbox{E}^{o}_{oxi}(anode)$
For example, the standard electrode potential for a copper electrode is:
$\mbox{Cell diagram}\,$$\mbox{Pt}(s)|\mbox{H}_{2}(1 atm)|\mbox{H}^{+}(1 M)||\mbox{Cu}^{2+}(1 M)|\mbox{Cu}(s)\,$$\mbox{E}^{o}_{cell}=\mbox{E}^{o}_{red}(cathode)-\mbox{E}^{o}_{red}(anode)$

We are all  IITians and here to help you in your IIT  JEE preparation.  All the best.

Sagar Singh
B.Tech IIT Delhi

```
6 years ago

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