The redox reaction involving the reducing power of hydrogen sulphide is:
S+2H++2e−→H2S,E∘S/H2S=+0.14VTwo other half equations are:
Fe3++e−→Fe2+E∘Fe3+/Fe2+=+0.77VBr2+2e−→2Br−E∘Br2/Br−=1.07VUnder standard conditions, hydrogen sulphide reacts with iron
(III) ions.
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