The standard reduction potential for the half-cell reaction, Cl2+2e−→2Cl− will be: Pt2++2Cl−→Pt+Cl2,Ecello=−0.15V; Pt2++2e−→Pt,Eo=1.20V
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A galvanic cell or simple battery is made of two electrodes. Each of the electrodes of a galvanic cell is known as a half cell. In a battery, the two half cells form an oxidizing-reducing couple. When two half cells are connected via an electric conductor and salt bridge, an electrochemical reaction is started.
The given reaction is, Pt2++2Cl−→Pt+Cl2,Ecell0=−0.15V
On reversing the above reaction, Pt+Cl2→Pt2++2Cl−,Ecell0=0.15V