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Can Fe^(3+) oxidises Bromide to bromine under standard conditions? Given : E_(Fe^(3+|Fe^(3+)))^(@)=0.771 ""E_(Br_(2)|Br^(-))^(@)=1.09V

Answer»

Solution :Required half cell REACTION
`2Br^(-) RARR Br_(2)+2E^(-) ""(E_("ox")^(@))=-1.09V`
`2Fe^(3+)+2e^(-) rarr 2Fe^(2+) "" (E_("red")^(@))=+0.771V`
`2Fe^(3+)+2Br^(-) rarr 2Fe^(2+)+Br_(2)""(E_("cell")^(@)=?)`
`E_("cell")^(@)=(E_("ox")^(@))+(E_("red")^(@))`
`""=-1.09+0.771`
`""=-0.319` V.
`E_("Cell")^(@)` is - ve, `DELTA`G is +ve and the cell reaction is non-spontaneous. Hence `Fe^(3+)` cannot OXIDISES `Br^(-) " to " Br_(2)`.


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