Q27Short answer
Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine?
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For the reaction – – 2Cl (aq) + 2H 2 O (l) → 2OH (aq)+H2 (g)+Cl 2 (g) V V V V Value of ∆G is + 422kJ. Using the equation ∆G = – nFE the value of E comes out to be –2.2V. Therefore extraction of Cl2 from brine will require an external emf of greater than 2.2V.