General Chemistry
General Chemistry
7th Edition
ISBN: 9780073402758
Author: Chang, Raymond/ Goldsby
Publisher: McGraw-Hill College
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Chapter 20, Problem 20.46QP
  1. a)
Interpretation Introduction

Interpretation: The complex which absorb the longer wavelength to be predicted.

Concept Introduction:

Spectrochemical series: The list of ligands arranged in an ascending order of (Δ)(the splitting of d-orbitals in presence of various ligands).

I-<Br-<SCN-<Cl-<S2-<F-<OH-<O2-<H2O<NCS-<edta4-<NH3<  en<NO2-<CN-<COweak-fieldincreasing(Δ)strong-fieldligandsligands

Crystal field splitting: The energy gap between the splitting of d-orbitals of the metal ion in presence of ligands is known as the crystal field splitting (Δ). The magnitude of (Δ) is depends on the nature of metal ions and the ligands.

To Identify: The complex which absorb the longer wavelength to be predicted.

  1. a)
Expert Solution
Check Mark

Answer to Problem 20.46QP

The ligand H2O is a weaker field ligand which absorbs the longer wavelength.

Explanation of Solution

Predict the complex which absorbs the longer wavelength.

In the given complex ions, the ligand H2O is a weak field ligand; also the crystal field splitting is less than the ligand NH3 which requires less energy (long wavelength) to promote the electrons from the lower energy level. Thus, the complex ion [Co(H2O)6]2+ absorbs the longer wavelength.

  1. b)
Interpretation Introduction

Interpretation: The complex which absorb the longer wavelength to be predicted.

Concept Introduction:

Spectrochemical series: The list of ligands arranged in an ascending order of (Δ)(the splitting of d-orbitals in presence of various ligands).

I-<Br-<SCN-<Cl-<S2-<F-<OH-<O2-<H2O<NCS-<edta4-<NH3<  en<NO2-<CN-<COweak-fieldincreasing(Δ)strong-fieldligandsligands

Crystal field splitting: The energy gap between the splitting of d-orbitals of the metal ion in presence of ligands is known as the crystal field splitting (Δ). The magnitude of (Δ) is depends on the nature of metal ions and the ligands.

To Identify: The complex which absorb the longer wavelength to be predicted.

  1. b)
Expert Solution
Check Mark

Answer to Problem 20.46QP

The ligand F- is a weaker field ligand which absorbs the longer wavelength.

Explanation of Solution

Predict the complex which absorbs the longer wavelength.

In the given complex ions, the ligand F- is a weak field ligand; also the crystal field splitting is less than the ligand CN which requires less energy (long wavelength) to promote the electrons from the lower energy level. Thus, the complex ion [FeF6]3- absorbs the longer wavelength.

  1. c)
Interpretation Introduction

Interpretation: The complex which absorb the longer wavelength to be predicted.

Concept Introduction:

Spectrochemical series: The list of ligands arranged in an ascending order of (Δ)(the splitting of d-orbitals in presence of various ligands).

I-<Br-<SCN-<Cl-<S2-<F-<OH-<O2-<H2O<NCS-<edta4-<NH3<  en<NO2-<CN-<COweak-fieldincreasing(Δ)strong-fieldligandsligands

Crystal field splitting: The energy gap between the splitting of d-orbitals of the metal ion in presence of ligands is known as the crystal field splitting (Δ). The magnitude of (Δ) is depends on the nature of metal ions and the ligands.

To Identify: The complex which absorb the longer wavelength to be predicted.

  1. c)
Expert Solution
Check Mark

Answer to Problem 20.46QP

The ligand Cl- is a weaker field ligand which absorbs the longer wavelength.

Explanation of Solution

Predict the complex which absorbs the longer wavelength.

In the given complex ions, the ligand Cl is a weak field ligand; also the crystal field splitting is less than the ligand NH3 which requires less energy (long wavelength) to promote the electrons from the lower energy level. Thus, the complex ion [CuCl4]2- absorbs the longer wavelength.

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Chapter 20 Solutions

General Chemistry

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