Transition metal compounds can show a number of different types of isomerism. Hydration isomerism is where different numbers of water molecules act as ligands. The name chromium (III) chloride is given to several chemical compounds with the formula $$\(\mathrm{CrCl}_{3} \cdot \mathrm{XH}_{2} \mathrm{O}\)$$, including a number of hydration isomers. Reinecke's salt has the formula $$\(\mathrm{NH}_{4}\left[\mathrm{Cr}(\mathrm{SCN})_{x}\left(\mathrm{NH}_{3}\right)_{y}\right] \cdot \mathrm{zH}_{2} \mathrm{O}\)$$. The anion exists as a trans-isomer. It contains 14.67\% chromium, 36.23\% sulfur, 4.51\% oxygen and 27.65\% nitrogen by mass. (i) Calculate the values $$\(\mathrm{x}, \mathrm{y}\)$$ and z in Reinecke's salt. You must show your working. (3) (ii) Draw a diagram of the anion of Reinecke's salt showing its three-dimensional shape. (2)
Exam No：wch15-01-que-20240113 Year：2024 Question No：17(c)
Answer:
- calculation of the moles of \(\mathrm{Cr}, \mathrm{S}\), O and N
- calculation of the ratio of moles
- calculation of \(x, y\) and \(z\)
An answer that makes reference to the following points:
- ammine ligands trans \(\left(180^{\circ}\right)\) to each other in an octahedral complex
- the rest of the ion correct including charge and at least one dot bond and one wedge bond or the rest of the ion correct including four ligands joined to show them in plane
- calculation of the ratio of moles
- calculation of \(x, y\) and \(z\)
An answer that makes reference to the following points:
- ammine ligands trans \(\left(180^{\circ}\right)\) to each other in an octahedral complex
- the rest of the ion correct including charge and at least one dot bond and one wedge bond or the rest of the ion correct including four ligands joined to show them in plane
Knowledge points:
17.Transition Metals and their Chemistry
Solution:
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