EasyChemistryHigh School (11–12)Coordination Compounds › Bonding: Valence Bond and Crystal Field TheoryNumericalA-LevelIB
The complex of a d¹ ion absorbs red light of wavelength 640 nm…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The complex of a ion absorbs red light of wavelength . Find the splitting in kJ/mol, and say what colour the solution shows.
Need a reminder? The key ideaShow
A d-d transition absorbs light of wavelength , and for a or ion in kJ/mol with in nm. The colour seen is opposite the colour absorbed. A or ion has no d-d transition. At , in kJ/mol, where is the stability constant.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The splitting. .
Step 2. The colour. The complex takes red light out of the white light. The colour opposite red on the wheel is green, so the solution looks green, often blue-green.
Answer: , and a green solution.
Check. A wavelength longer than gives a splitting below . The value is smaller, as it should be.
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