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  • Why is an external emf of more than 2.2V required for the extraction of Cl_{2} from brine?

Why is an external emf of more than 2.2V required for the extraction of Cl_{2}  from brine?

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In the process of extraction of Cl_{2} from brine solution :

2Cl^{-}(aq)+2H_{2}O(l)\rightarrow 2OH^{-}(aq)+H_{2}(g)+Cl_{2}(g) the value of \Delta G^{\Theta } is +ve \; (422\; KJ).

For this the value of E^{\Theta } is \Delta G^{\Theta }=-nFE^{\Theta } or E^{\Theta }=-\frac{\Delta G^{\Theta }}{nF}=-\frac{422\times 10^{3}J}{2\times 96500}=-2.20\; V

Hence, An external emf more than 2.20 V is required for extraction of Cl_{2} from brine solution for electrolysis process.

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