Chelate Effect
Mediumchemistry
Chelate complexes are more stable than similar non-chelate complexes due to:
Select the correct option:
Solution
Incorrect! Answer:
Entropy factor
The Chelate Effect refers to the increased stability of complexes containing polydentate (chelating) ligands compared to monodentate ones.
- When a chelating ligand (like ethylenediamine) replaces two monodentate ligands (like NH3): [M(NH3)2]+en⇌[M(en)]+2NH3
- The number of particles in the solution increases (from 2 reactants to 3 products).
- This leads to an increase in entropy (ΔS>0), making the Gibbs free energy ΔG=ΔH−TΔS more negative.
- Therefore, the chelate effect is primarily entropy-driven.
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- chelate effect
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Entropy factor
The Chelate Effect refers to the increased stability of complexes containing polydentate (chelating) ligands compared to monodentate ones.
- When a chelating ligand (like ethylenediamine) replaces two monodentate ligands (like NH3): [M(NH3)2]+en⇌[M(en)]+2NH3
- The number of particles in the solution increases (from 2 reactants to 3 products).
- This leads to an increase in entropy (ΔS>0), making the Gibbs free energy ΔG=ΔH−TΔS more negative.
- Therefore, the chelate effect is primarily entropy-driven.
This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of chelate effect. It appeared in the 2025 exam.
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