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Question

The redox reaction involving the reducing power of hydrogen sulphide is:
S+2H++2eH2S,ES/H2S=+0.14V
Two other half equations are:
Fe3++eFe2+EFe3+/Fe2+=+0.77V
Br2+2e2BrEBr2/Br=1.07V
Under standard conditions, hydrogen sulphide reacts with iron (III) ions.
If this statement is true enter 1, else enter 0.

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Solution

Yes, Fe3+ ions will oxidise H2S to S
2Fe3++H2S2Fe2++2H++S
Since , E=0.770.14=0.63V
and thus G=nFEcell=ve
Note: A cell reaction is spontaneous
if Ecell=+ve and G=ve
Ecell=Eox+Ered
(take values as per half-reactions)

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