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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

When concentrated hydrochloric acid is added to a red solution containing the Co(H2O)62+ complex ion, the solution turns blue as the tetrahedral CoCl42− complex ion forms. Explain this color change.

Interpretation Introduction

Interpretation: An explanation for the change in the color of Co(H2O)62+ complex ion solution on addition of concentrated hydrochloric acid is to be stated.

Concept introduction: There is degeneracy in the d orbitals of a transition metal atom or ion. It means they have same energy levels. But when they interact with ligands, the d orbitals become non degenerate, i.e. they do not have same energy. Color of the complex ions depends upon how the 3d electrons occupy the split energy levels.

To determine: An explanation for the change in the color of Co(H2O)62+ complex ion solution on addition of concentrated hydrochloric acid.

Explanation

Explanation

Most of the transition metal complexes are colored because they absorb visible light of specific wavelengths.

The color of Co(H2O)62+ complex ion solution is red. When concentrated hydrochloric acid is added, the color of the solution becomes blue due to the formation of tetrahedral CoCl42 complex. The splitting of d orbital in tetrahedral complexes is much less than octahedral complexes

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