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Edexcel A-Level Chemistry A2 17.25 Understand in Terms of the Positive Increase in Ssystem That the Substitution of a Monodentate Ligand By a Bidentate or Questions

Practise Edexcel IAL Chemistry 17.25 by counting particles released in ligand substitution, linking multidentate binding to entropy increase and comparing EDTA, salen and related ligands.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • Count particles in ligand substitution equations to justify positive ΔSsystem.
  • Explain EDTA or salen stability through multidentate binding and entropy increase.
  • Compare ligand choices by the number of coordinate bonds and particles released.

Edexcel A-Level Chemistry A2 17.25 Understand in Terms of the Positive Increase in Ssystem That the Substitution of a Monodentate Ligand By a Bidentate or Questions question 1

[Maximum number: 2]

This question is about compounds and complex ions of iron.

Ethanedioate ligands react with iron(II) ions in aqueous solution.

[Fe(H2O)6]2++2C2O42−→[Fe(C2O4)2(H2O)2]2−+4H2O\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}+2 \mathrm{C}_{2} \mathrm{O}_{4}^{2-} \rightarrow\left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2-}+4 \mathrm{H}_{2} \mathrm{O}

Explain, in terms of entropy, why this reaction is feasible.

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