In the extraction of chlorine from brine

Electrolysis of brine solution is used to extract chlorine. Overall chemical reaction occurring in this process and value of ∆Go can be shown as2H2O(l)+2Cl−(aq)⟶H2(g)+Cl2(g)+2OH−(aq)For the given reaction, value of ΔG∘ is +422 kJUsing ΔG∘=−nFEc the value of E∘=−2.2V.Therefore,ΔG∘for the overall reaction is positive and Eohas negative value.