Practice Formation Of Coloured Ions (4.3.10) - The d

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6 sample questions

Question 1.
What is a coloured ion?
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Think about the light absorption and the colour perceived.
Question 2.
What role do ligands play in forming coloured complexes?
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Consider how different ligands might change an ion's appearance.
3Question 3.
What causes a transition metal ion to be coloured?
- Presence of unpaired electrons
- Excitation of d electrons
- Amount of metal present
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Think about what changes in the ion structure lead to colour.
4Question 4.
True or False: The observed colour of an ion is the same as the colour it absorbs.
- True
- False
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Recall the complementary colour theory.
Question 5.
Given a transition metal compound that appears green, identify potential ligands that could cause this coloration and justify your reasoning.
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Consider what ligands typically impart colour to compounds and their charge.
Question 6.
Describe a laboratory procedure to determine the concentration of an unknown cobalt(II) ion solution using its colour.
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Remember how colour intensity relates to concentration in dilutions.

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