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Write the cell reaction that occurs when...

Write the cell reaction that occurs when the following half-cells are combined.
`I_(2)+2e^(-)to 2l^(-)(IM) , " "E^(@)=0.54 V`
`Br_(2)+2e^(-)to 2Br^(-)(IM) , " "E^(@)=1.08 V`

Text Solution

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The half cell reaction with lesser value of `E^(@)` takes place at the anode while the other takes place at cathode. Thus,
At anode: `2I^(-) + 2e^(-) to 2Br^(-)`
at cathode: `2I^(-) + Br_(2) to I_(2) + 2Br^(-)`
`EMF_("cell") =E_( c)^(@) - E_(a)^(@) = 1.08 -0.54 = 0.54 V`
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