Describe the method of obtaining chlorine fro | vedclass

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(A) The process of obtaining chlorine from brine (sea water) is as follows: $2Cl^-_{(aq)} + 2H_2O_{(l)} \rightarrow 2OH^-_{(aq)} + H_{2(g)} + Cl_{2(g)

Vedclass · Accepted Answer

Anode: $Cl_2$,Cathode: $H_2$ and $NaOH$

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(A) The process of obtaining chlorine from brine (sea water) is as follows: $2Cl^-_{(aq)} + 2H_2O_{(l)} \rightarrow 2OH^-_{(aq)} + H_{2(g)} + Cl_{2(g)}$ For this reaction,$\Delta G^{\ominus} = +422 \ kJ$. Using the formula $\Delta G^{\ominus} = -nFE^{\ominus}$,we calculate $E^{\ominus} = -2.2 \ V$. Thus,by applying an external $EMF$ greater than $2.2 \ V$,the reaction proceeds in the forward direction. However,in electrolysis,additional potential is required to overcome certain hindering reactions. Therefore,chlorine gas is obtained by electrolysis,while $H_2$ and aqueous $NaOH$ are obtained as by-products. Electrolysis of molten $NaCl$ can also be performed,but in that case,$Na$ metal is obtained instead of $NaOH$.

Describe the method of obtaining chlorine from brine (sea water) and write the oxidation-reduction reactions,specifying the products at the anode and cathode.

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