The compound with the formula TII3 is a black solid. Given the following standard reduction pote

step 1 So here we have some given reactions and the first thing we are looking to do is identify the re

The compound with the formula TII3 is a black solid. Given...

The compound with the formula $\mathrm{TII}_{3}$ is a black solid. Given the following standard reduction potentials, $\begin{aligned} \mathrm{Tl}^{3+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Tl}^{+} & & 8^{\circ}=1.25 \mathrm{~V} \\ \mathrm{I}_{3}^{-}+2 \mathrm{e}^{-} \longrightarrow 3 \mathrm{I}^{-} & & \mathscr{C}^{\circ} &=0.55 \mathrm{~V} \end{aligned}$ would you formulate this compound as thallium(III) iodide or thallium(I) triiodide?

The compound with the formula $\mathrm{TII}_{3}$ is a black solid. Given the following standard reduction potentials,
$\begin{aligned} \mathrm{Tl}^{3+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Tl}^{+} & & 8^{\circ}=1.25 \mathrm{~V} \\ \mathrm{I}_{3}^{-}+2 \mathrm{e}^{-} \longrightarrow 3 \mathrm{I}^{-} & & \mathscr{C}^{\circ} &=0.55 \mathrm{~V} \end{aligned}$
would you formulate this compound as thallium(III) iodide or thallium(I) triiodide?

Key Concepts

Standard Reduction Potentials

This concept refers to the measurement of the tendency of a chemical species to be reduced, quantified by the standard reduction potential (E°). In this question, comparing the high value for the Tl³?/Tl? couple (1.25 V) with the lower value for the I??/I? couple (0.55 V) helps determine which species is more inclined to gain electrons. A higher potential means the species readily undergoes reduction, indicating that Tl³? is more likely to be reduced to Tl?, affecting the formulation of the compound.

Oxidation State Stability

This concept involves understanding which oxidation states of an element are most stable under given conditions, often influenced by factors such as the inert pair effect. In the case of thallium, the +1 oxidation state is more stable than the +3 state because of the reluctance of its s-electrons to participate in bonding. This stability trend is central to deciding that the compound is better described as containing thallium in the +1 state.

Polyiodide Ions

This concept covers the formation and properties of polyiodide ions such as I??, which is a complex ion often encountered in iodine chemistry. I?? forms when iodide ions interact with molecular iodine. Its formation and inherent stability are crucial in understanding the composition of the compound, suggesting that the iodine component is present as a triiodide ion.

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