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Can Fe^(3+)oxidises Bromide to bromime under standard conditions ? Given : E_(Fe^(3+)rfloorFe^(2+))^@=0.771""E_(Br_2|Br^(-))^@=-1.09V

Answer»

Solution :Required half cell reaction
`2Br^(-)rarrBr^2+2e^(-)""(E_("ox")^@)=-1.09V`
`2Fe^(3+)+2e^(-)rarr2Fe^(2+)""(E_("red")^@)=+0.771V`
`2Fe^(3+)+2Br^(-)rarr2Fe^(2+)+Br_2""(E_("cell")^@)=? `
`E_("cell")^@=(E_("ox")^@)+(E_(red")^@)=-1.09+0.771=-0.319V`
We KNOW that `DeltaG^@=-nFE_("cell")^@`
If `E_("cell")^@" is "-ve, DeltaG` is +ve and the cell reaction is non - SPONTANEOUS:
Hene , `FE^(3+)` cannot oxidise BROMIDE to BROMINE.


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