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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
D FeCl₃(aq) and concentrated HCl(aq)
Answer
The correct reagents that react to produce a tetrahedral complex are FeCl₃(aq) and concentrated HCl(aq). In a tetrahedral complex, the metal ion typically coordinates to ligands in a way that creates a geometry characterized by four coordination sites in a tetrahedral arrangement.
In this case, Fe³⁺ ions from FeCl₃ can coordinate with the chloride ions provided by the concentrated HCl, resulting in a tetrahedral complex. The other options either do not produce this geometry or do not react as indicated to form a tetrahedral complex.