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3A solution c...

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3A solution contains Fe2, Fe3 and I ions. This solutionwas treated with iodine at 35^° C. E^° for Fe3 /Fe2+ is+0.77 V and E^° for I/21 =0.536 V. The favourableredox reaction is\lbrack AIPMT (Mains)-2011\rbrack

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Q. A solution contains

{F e}^{2 +}, {F e}^{3 +}

I^{-}

ions. This solution was treated with iodine at

35^{o} C

E^{0}

{F e}^{3 +} / {F e}^{2 +}

+ 0.77 V

E^{o}

I_{2} / 2 I^{-} = 0.536 V

. The favourable redox reaction is:

Q. For the reaction,

F e^{3 +} + 3 e ⇌ F e, E^{o}

is -0.036 V and the standard electrode potential(SEP) for

F e^{3 +} + e ⇌ F e^{2 +}

is 0.77 V.
Hence,

E^{o}

F e^{2 +} + 2 e ⇌ F e

E_{F e^{2 +} / F e}^{\circ} = - 0.44 V and E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.77 V

E_{F e^{3 +} / F e}^{\circ}

E_{F e^{2 +} | F e}^{⊖}

E_{F e^{3 +} | F e^{2 +}}^{⊖}

are -0.44 and 0.77 V respectively.
If

F e^{2 +}, F e^{3 +}

F e

blocks are kept together, then:

If $F e^{3 +} + y^{4 -} ⇌ F e Y^{⊖}; K_{f} = 1.3 \times 10^{25}$

$F e^{3 +} + Y^{4 -} ⇌ F e Y^{2 -}; K_{f} = 2.1 \times 10^{14}$

And $F e^{3 +} + e^{-} ⇌ F e^{2 +}; E^{⊖} = + 0.77 V$

E^{⊖}

F e Y^{⊖} + e^{-} \to F e Y^{2 -}

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