Of the following complex ions: [CrCl(NH₃)₅]²⁺, [Cr(NH₃)6]³⁺, [CrCl(H₂O)₅]²⁺, [Cr(H₂O)₆]³⁺, one appears pink, one yellow, one blue-green and one violet. Which is blue-green? A) [Cr(NH₃)₆]³⁺ B) [CrCl(NH₃)₅]²⁺ C) [CrCl(H₂O)₅]²⁺ D) [Cr(H₂O)₆]³⁺ E) both [CrCl(H₂O)₅]²⁺ and [CrCl(NH₃)₅]²⁺

Question

Quizplus · Accepted Answer

The complex ion [CrCl(H₂O)₅]²⁺ is blue-green. The chloride ion contributes to the color as it is a weak field ligand, while the histidinate (H₂O) and sulfinate (₅) ligands have minimal effect on color.

Of the Following Complex Ions: [CrCl(NH3)5]2+, [Cr(NH3)6]3+, [CrCl(H2O)5]2+, [Cr(H2O)6]3+, One

Of the Following Complex Ions: [CrCl(NH₃)₅]²⁺, [Cr(NH₃)6]³⁺, [CrCl(H₂O)₅]²⁺, [Cr(H₂O)₆]³⁺, One