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Write the cell reaction that occurs when...

Write the cell reaction that occurs when the folowing half cells are combined.
`I_(2)+2e^(-)rarr2I^(-)(1M), E^(@)=+0.54 V`
`Br_(2)+2e^(-)rarrBr^(-)(1M),e^(@)=+1.08 V`

Text Solution

Verified by Experts

The half cell reaction with lesser value of `E^(@)` takes place at the anode while the other takes place at cathode. Thus,
At anode `2l^(-) rarr l_(2) + 2e^(-)`
`ul("At cathode" Br_(2) + 2e^(-) rarr 2Br^(-))`
Cell reaction `2l^(-) + Br_(2) rarr l_(2) + 2Br^(-)`
`EMF_("Cell") = E_(C)^(@) - E_(a)^(@)`
`=1.08 -0.54 = 0.54V`
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