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Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine?

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Value of ΔGΘ is + 422kJ. Using the equation ΔGΘ = – nFEΘ the value of EV comes out to be –2.2V. Therefore extraction of Cl2 from brine will require an external emf of greater than 2.2V.

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