## 14.33 (b) Half-reactions

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

Nancy Dinh 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:07 am

### 14.33 (b) Half-reactions

14.33 (b): Will Tl+ disproportionate in aqueous solution?

The solution manual uses the half equations $Tl^{+} + e^{-} \rightarrow Tl$ and $Tl^{+} \rightarrow Tl^{3+} + 2e^{-}$.

Why can't you use $Tl \rightarrow Tl^{3+} + 3e^{-}$ instead of $Tl^{+} \rightarrow Tl^{3+} + 2e^{-}$? Both would get you the equation $3Tl^{+} \rightarrow Tl^{3+} + 2Tl$ but different values of E. When do you know when to use which?

Alyssa Parry Disc 1H
Posts: 53
Joined: Sat Jul 22, 2017 3:01 am

### Re: 14.33 (b) Half-reactions

I think it is because Tl+ is more stable than Tl3+

Shawn Patel 1I
Posts: 54
Joined: Thu Jul 27, 2017 3:01 am

### Re: 14.33 (b) Half-reactions

Hey,
Normally you could use that half reaction, but the values for the e cell are not given. Also, the question asks if it disproportionates, which means that the element would act as both an oxidating agent and reducing agent, so you would have to use the two half reactions in the solution manual.

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