Question

7. Three different solutions with orange, green, and violet colors were prepared. Associate each color to the following complexes: (CrCle] [CrNH . and Cr(HO) 8. Explain why the complex [Fe(H2O)" has 4 = 14,000 cm, while [Fe(H2O) has do = 9,350 cm! 9. Suggest a reason why copper(II) compounds are often colored but copper(l) compounds are colorless. 10. Sketch the d-orbital energy-level diagram for a square planar complex Spectrochemical series: COCN' >phen > NO2 >en > NH3> NCS-> H2O > F>RCOO-> H > Cr> Br> 650 nm O 580 nm 750 nm 100 nm 560 nm 430 nm 190 nm

Answer 1

Question 7.

The color of [CrCl6]^3- is orange

The color of [Cr(NH3)6]³⁺ is violet

The color of [Cr(H2O)6]³⁺ is green

Explanation: Ligand field strength order: NH3 > H2O > Cl

Therefore, the crystal field splitting energy order: [Cr(NH3)6]³⁺ > [Cr(H2O)6]³⁺ > [CrCl6]^3-

Hence, the wave length order: [Cr(NH3)6]³⁺ < [Cr(H2O)6]³⁺ < [CrCl6]^3-

The wave legnth order of given three colors: violet < green < orange