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Which pair of reagents reacts to form a tetrahedral complex? A CoCl₂(aq) and concentrated NH₃(aq) B CuSO₄(aq) and concentrated NH₃(aq) C CuSO₄(aq) and sodium ethanedioate(aq) D FeCl₃(aq) and concentrated HCl(aq) - AQA - A-Level Chemistry - Question 19 - 2022 - Paper 3
Question 19
Which pair of reagents reacts to form a tetrahedral complex? A CoCl₂(aq) and concentrated NH₃(aq) B CuSO₄(aq) and concentrated NH₃(aq) C CuSO₄(aq) and sodium ethane... show full transcript
Worked Solution & Example Answer:Which pair of reagents reacts to form a tetrahedral complex? A CoCl₂(aq) and concentrated NH₃(aq) B CuSO₄(aq) and concentrated NH₃(aq) C CuSO₄(aq) and sodium ethanedioate(aq) D FeCl₃(aq) and concentrated HCl(aq) - AQA - A-Level Chemistry - Question 19 - 2022 - Paper 3
Step 1
Which pair of reagents reacts to form a tetrahedral complex?
Answer
To determine which pair of reagents forms a tetrahedral complex, we should consider the nature of the reagents and their ability to facilitate ligand field stabilization.
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Review of Options:
- A. CoCl₂(aq) and concentrated NH₃(aq): Cobalt(II) typically forms octahedral complexes.
- B. CuSO₄(aq) and concentrated NH₃(aq): Copper(II) generally forms square planar complexes in the presence of strong field ligands like NH₃.
- C. CuSO₄(aq) and sodium ethanedioate(aq): This also tends to favor octahedral or square planar arrangements.
- D. FeCl₃(aq) and concentrated HCl(aq): Iron(III) can form tetrahedral complexes, especially in acidic environments when coordinated with ligands like chloride.
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Conclusion: Based on the analysis, the pair of reagents that reacts to form a tetrahedral complex is option D: FeCl₃(aq) and concentrated HCl(aq).