6th edition, 14.33

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Hai-Lin Yeh 1J
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6th edition, 14.33

a) The standard Gibbs free energy of formation of Tl3+(aq) is +215 kJ.mol-1 at 25C. Calculate the standard potential of the Tl3+/Tl couple. (b) Will Tl+ disproportionate in aqueous solution

Can someone explain how a redox couple works and for b) I found delta G in the end, but how does delta G for Tl+ being very large and positive answer whether Tl+ will disproportionate in aqueous solution? Does it mean if it is positive, therefore, not spontaneous and not favoring the forward reaction, mean Tl+ will NOT disproportionate in aqueous solution?

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Re: 6th edition, 14.33

The redox couple just refers to a transfer of electrons between the two species in that couple. The idea here is to find the delta G for the disproportionate reaction to determine whether this reaction is spontaneous or not. If it's spontaneous, it will proceed. If not spontaneous, then it will not proceed.