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Chapter 27: Problem 16

Discuss the mechanism for the quantitative transfer of chloride ion from Co to \(\mathrm{Cr}\) in \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right]^{2+}\) and \(\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\).

Short Answer

Expert verified
The chloride ion could possibly transfer from the cobalt complex to the chromium complex through a process of ligand rearrangement and exchange, though certain conditions like pH, temperature, and concentrations would need to be met for the transfer to be quantitative.

Step by step solution

01

Understand the complex ions

The given ions are two types of coordination complexes: \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5}\mathrm{Cl}\right]^{2+}\) and \(\left[\mathrm{Cr}\left(\mathrm{H}_{2}\mathrm{O}\right)_{6}\right]^{2+}\). The cobalt-based complex is a hexacoordinate complex with cobalt in the +3 oxidation state. It has one chloride ion and five ammonia molecules as ligands. The chromium-based complex is also a hexacoordinate complex, with chromium in the +3 oxidation state and six water molecules as ligands.
02

Analyze the potential for chloride ion transfer

In order for the chloride ion to transfer from the cobalt complex to the chromium complex, it must overcome the attraction from the positively-charged cobalt ion and reattach to the chromium ion. Given that both metals have the same +3 charge, a singular transfer could theoretically occur if the Chromium complex encounters the Cobalt complex and the conditions favor the chloride’s attachment to Chromium.
03

Consider the role of ligands

The ligands involved (ammonia for cobalt and water for chromium) may play a significant role in this mechanism. Despite both being neutral ligands, they can influence the electronic environment around the metal ion and impact stability. The ammonia and water ligands need to accommodate the transfer of the chloride ion, requiring some level of ligand rearrangement.
04

Conclude the mechanism

Given the aforementioned considerations, the chloride ion could possibly be transferred quantitatively from the cobalt complex to the chromium complex through a process of ligand exchange, in the right conditions. Notably, although feasible, this transfer would be greatly affected by conditions like pH, temperature, and concentration, and might demand a specific set of conditions to occur quantitatively.

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Most popular questions from this chapter

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