[xshadow]

1)  I read that " the I₃^-  can oxidize Fe(II) to Fe(III)

But looking at the standard potential  reduction I see:

Fe(III) --> Fe(II)    E° = 0,771
I₃^- --> I^-    E° =  0,53

Now
Ecell = E cat - E ano. = 0,53 - 0,771 ---> negative value so the oxidation shouldn t occour....Am I wrong?

2) another question...can Bromide oxidize Fe(II) to Fe(III) ?? I think yes looking at the standard cell potential

THANKS

[Borek]

1)  I read that " the I₃^-  can oxidize Fe(II) to Fe(III)

In what conditions?

[xshadow]

1)  I read that " the I₃^-  can oxidize Fe(II) to Fe(III)

In what conditions?

A solution with KI + Fe(II) and then I add CuSO4

I read that CuSO4  is reduced by I^- and I₃^- is formed. This species than can oxidize Fe(II) to Fe(III)


I don't know if it's right...

[Borek]

Doesn't sound viable.

Yes, the first stage - with production of CuI - works. But from what I remember oxidation of Fe(II) with I₂ requires some complexing agent, that changes the formal potential for Fe(II)/Fe(III) oxidation.

[mjc123]

And bromide can't oxidize anything. What would it be reduced to?

[xshadow]

And bromide can't oxidize anything. What would it be reduced to?

Sorry I mean Bromine (Br₂)

[xshadow]

Doesn't sound viable.

Yes, the first stage - with production of CuI - works. But from what I remember oxidation of Fe(II) with I₂ requires some complexing agent, that changes the formal potential for Fe(II)/Fe(III) oxidation.

mhhh.
Thanks!!!