Ligand Substitution Experiments (AQA A-Level Chemistry): Quizzes

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Ligand Substitution Experiments
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How many bonds does a monodentate ligand form with a metal ion?

One bond

What complex forms when excess ammonia is added to [Cu(H2O)6]2+[Cu(H₂O)₆]²⁺?

[Cu(NH3)4(H2O)2]2+[Cu(NH₃)₄(H₂O)₂]²⁺

What colour change occurs when HCl is added to copper(II) ions?

Light blue to yellow-green

What colour precipitate forms when ammonia is added to [Fe(H2O)6]3+[Fe(H₂O)₆]³⁺?

Brown

Why are complexes with multidentate ligands more stable than with monodentate ligands?

Due to the chelate effect

What happens to entropy when a multidentate ligand binds to a metal ion?

Entropy increases

In the Lambert-Beer law A=εclA = εcl, what does ll represent?

Path length of the cuvette

What is the shape and coordination of the [CuCl4]2−[CuCl₄]²⁻ complex?

Tetrahedral

What colour is [Fe(H2O)6]2+[Fe(H₂O)₆]²⁺ compared to [Fe(H2O)6]3+[Fe(H₂O)₆]³⁺?

Green vs pale violet

How does the rate of substitution compare between monodentate and multidentate ligands?

Monodentate show fast substitution

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