Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 23 - Problems: 23.98

Answer

See explanation below.

Work Step by Step

Given that three of the complex ions that are formed by Co3+ are [Co(H2O)6]3+, [Co(NH3)6]3+, and [CoF6]3-.The order of ligand-field strength is: NH3>H2O>F-. So this suggests that [Co(NH3)6]3+ absorbs higher energy light, then [Co(H2O)6]3+ and [CoF6]3-.This suggests that as [Co(NH3)6]3+ absorbs blue-green, it appears yellow-orange.[Co(H2O)6]3+ absorbs orange light and appear blue.[CoF6]3- absorbs red light and appears green.
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