Stability Constant Concept
Mediumchemistry
Higher stability of chelates compared to analogous monodentate complexes is primarily due to:
Select the correct option:
Solution
Incorrect! Answer:
Chelate effect (entropy gain)
- Chelation: When a multidentate ligand binds to a metal to form a ring structure.
- Thermodynamic Basis: Consider the displacement reaction: [M(NH3)6]+3(en)→[M(en)3]+6(NH3).
- Entropy (ΔS): In this reaction, 4 reactant particles produce 7 product particles. This large increase in molecular dispersal leads to a high entropy gain.
- Stability: This favorable entropy change makes the formation constant (β) for chelates several orders of magnitude higher than for non-chelating complexes.
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About This Question
- Subject
- chemistry
- Chapter
- coordination compounds
- Topic
- stability constant concept
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Chelate effect (entropy gain)
- Chelation: When a multidentate ligand binds to a metal to form a ring structure.
- Thermodynamic Basis: Consider the displacement reaction: [M(NH3)6]+3(en)→[M(en)3]+6(NH3).
- Entropy (ΔS): In this reaction, 4 reactant particles produce 7 product particles. This large increase in molecular dispersal leads to a high entropy gain.
- Stability: This favorable entropy change makes the formation constant (β) for chelates several orders of magnitude higher than for non-chelating complexes.
This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of stability constant concept. It appeared in the 2025 exam.
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