Chapter 19, Problem 61E

Interpretation Introduction

Interpretation: Thecolors of given complexes in the given test-tubes needs to be determined.

  ${{\text{[Cr(H}}_{\text{2}}{\text{O)}}_{\text{6}}\text{]}}^{\text{3+}}$ and ${{\text{[Cr(H}}_{\text{2}}{\text{O)}}_4{\text{Cl}}_{\text{2}}\text{]}}^{\text{+}}$

  ${{\text{[Cr(NH}}_{\text{3}}{\text{)}}_{\text{6}}\text{]}}^{\text{3+}}$

Concept Introduction:

Crystal field theory is the theory given to explain the bonding in the coordination complexes. As ligand approaches towards the metal ion, the d-orbital of metal ion divide according to the energy of metal ion. On the basis of energy and degeneracy, the d-orbital can be classified as ${\text{t}}_{\text{2g}}$ and ${\text{e}}_{\text{g}}$ orbitals. The electrons will fill according to their energy levels.

The spectrochemical series can be defined as the series of ligands in order of their ability of splitting the d-orbitals.

It can be used to study the light absorbed by the complexes as it shows the ligands from strong field to weak field.