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Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

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BuyFindarrow_forward

Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 20, Problem 58E
Textbook Problem
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The complex ion Cu(H2O)62+ has an absorption maximum at around 800 nm. When four ammonias replace water, Cu(NH3)4(H2O)22+, the absorption maximum shifts to around 600 nm. What do these results signify in terms of the relative field splittings of NH3 and H2O? Explain.

Interpretation Introduction

Interpretation: It is given that, the complex ion Cu(H2O)63+ has an absorption maximum at around 800 nm . When four ammonias replace water, Cu(NH3)4(H2O)22+ the absorption maximum shifts to around 600 nm . Significance of these results in terms of the relative field splitting of NH3 and H2O is to be stated.

Concept introduction: The capacity to absorb light by complex ion is directly proportional to crystal field splitting energy and energy absorbed is inversely proportional to the wavelength.

To determine: The significance of the given results in terms of the relative field splitting of NH3 and H2O .

Explanation of Solution

Explanation

Given

The maximum wavelength for Cu(H2O)63+ is 800 nm .

The maximum wavelength for Cu(NH3)4(H2O)22+ is 600 nm .

Formula

The energy absorbed by light is given by the expression,

E=hcλ

Where,

  • E is the energy absorbed.
  • h is the Planck’s constant.
  • c is the velocity of light.

It is clear from the above equation that, energy absorbed is inversely proportional to the wavelength. This means that higher the splitting energy, lower will be the wavelength

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Chapter 20 Solutions

Chemistry: An Atoms First Approach
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