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Chapter 24: Problem 71

The coordination number of \(\mathrm{Pt}\) in the complex ion \(\left[\mathrm{PtCl}_{2}(\mathrm{en})_{2}\right]^{2+}\) is \((\mathrm{a}) 2 ;(\mathrm{b}) 3 ;(\mathrm{c}) 4 ;(\mathrm{d}) 5 ;(\mathrm{e}) 6\).

Short Answer

Expert verified
The coordination number of \(\mathrm{Pt}\) in the complex ion \( \left[\mathrm{PtCl}_{2}(\mathrm{en})_{2}\right]^{2+} \) is 6.

Step by step solution

01

Identify the central atom and its ligands

The central atom in this complex is platinum, \( \mathrm{Pt} \). The ligands - atoms or ions which are directly bonded to the central atom - are chlorine (\( \mathrm{Cl} \)) and ethylenediamine (\( \mathrm{en} \)). Both of the ligands are directly bonded to \( \mathrm{Pt} \). There are 2 \( \mathrm{Cl} \) and 2 \( \mathrm{en} \) ligands, but it's crucial to remember that \( \mathrm{en} \) is a bidentate ligand, meaning each \( \mathrm{en} \) forms 2 bonds with \( \mathrm{Pt} \).
02

Determine the coordination number

To determine the coordination number of \( \mathrm{Pt} \), count the total number of direct bonds to \( \mathrm{Pt} \). There are 2 bonds from the \( \mathrm{Cl} \) ligands, and 2 \(\times\) 2 bonds from the \( \mathrm{en} \) ligands (since \( \mathrm{en} \) is bidentate). Thus, the total number of direct bonds to \( \mathrm{Pt} \) is 2 \( \mathrm{Cl} \) + 2 \( \times\) 2 \( \mathrm{en} \) = 6. Therefore, the coordination number of \( \mathrm{Pt} \) is 6.

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Most popular questions from this chapter

In Example \(24-5,\) we chose between a tetrahedral and a square-planar structure for \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) based on magnetic properties. Could we similarly use magnetic properties to establish whether the ammine complex of \(\mathrm{Ni}(\mathrm{II})\) is octahedral \(\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\) or tetrahedral \(\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} ?\) Explain.

Explain the following observations in terms of complex-ion formation. (a) \(\mathrm{Al}(\mathrm{OH})_{3}(\mathrm{s})\) is soluble in \(\mathrm{NaOH}(\mathrm{aq})\) but insoluble in \(\mathrm{NH}_{3}(\mathrm{aq})\) (b) \(\mathrm{ZnCO}_{3}(\mathrm{s})\) is soluble in \(\mathrm{NH}_{3}(\mathrm{aq}),\) but \(\mathrm{ZnS}(\mathrm{s})\) is not. (c) The molar solubility of AgCl in pure water is about \(1 \times 10^{-5} \mathrm{M} ;\) in \(0.04 \mathrm{M} \mathrm{NaCl}(\mathrm{aq}),\) it is about \(2 \times 10^{-6}; \mathrm{M}\) but in \(1 \mathrm{M} \mathrm{NaCl}(\mathrm{aq}),\) it is about \(8 \times 10^{-5} \mathrm{M}\).

Indicate what type of isomerism may be found in each of the following cases. If no isomerism is possible, so indicate. (a) \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{CuCl}_{4}\right]\) (b) \(\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{SCN}\right]^{4-}\) (c) \(\left[\mathrm{NiCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{+}\) (d) \(\left[\mathrm{PtBrCl}_{2}(\mathrm{py})\right]\) (e) \(\left[\mathrm{Cr}(\mathrm{OH})_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{-}\)

Explain the important distinction between each of the following pairs: (a) coordination number and oxidation number; (b) monodentate and polydentate ligands; (c) cis and trans isomers; (d) dextrorotatory and levorotatory compounds; (e) low-spin and highspin complexes.

Draw dashed and solid wedge diagrams of transplatin, trans-Pt( \(\mathrm{NH}_{3}\) ) \(_{2} \mathrm{Cl}_{2}\), and cisplatin, \(\operatorname{cis}-\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\) Then, explain how transplatin can be more reactive yet less effective at killing cancer cells than is cisplatin.
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