Which of the following is the cell reaction that occurs when the following half-cells are combined? I2+2e−→2I−(1M); Eo=+0.54V Br2+2e−→2Br−(1M);Eo=+1.09V
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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.
Reduction potential of both I2 and Br2 is given. We have to note that more the value of reduction potential then less the element has the tendency to get reduced and hence I2 having more reduction potential acts as anode i.e. undergoes oxidation. And Br2 having less reduction potential than I2 undergoes reduction and acts as cathode.
2I−→I2+2e− (Oxidation) Br2+2e−→2Br− (Reduction) ____________________________ 2I−+Br2→I−2+2Br− is net cell reaction ___________________________