Chapter 20, Problem 20.109SP

Interpretation Introduction

Interpretation:

Why ${\text{Cr}}^{\text{3+}}\left(\text{aq}\right)$ is violet but ${\text{Y}}^{\text{3+}}\left(\text{aq}\right)$ is colorless has to be explained.

Concept Introduction:

Visible region: The electromagnetic radiation in range of $400-700nm$ is regarded as visible region which is actually visible to human eyes.

Absorption spectrum: It is an electromagnetic spectrum where the radiation transmitted via substance shows bands as a result of absorbing intensity of radiation at specific wavelength.

When the electron gets excited from lower to higher levels the energy gap lies in visible region was absorbed and the corresponding complementary color was shown by the complex.