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Figure 3 shows some reactions of aqueous iron ions - AQA - A-Level Chemistry - Question 4 - 2019 - Paper 1
Question 4
Figure 3 shows some reactions of aqueous iron ions. Solution containing Complex ion L Reaction 1 Na2CO3(aq) → Precipitate J Reaction 2 Concentrated HCl(aq) ... show full transcript
Worked Solution & Example Answer:Figure 3 shows some reactions of aqueous iron ions - AQA - A-Level Chemistry - Question 4 - 2019 - Paper 1
Step 1
Give the formula of Precipitate J and state its colour. Give an equation for Reaction 1.
Answer
The formula of Precipitate J is [ \text{Fe(OH)}_3 ]. The colour of Precipitate J is brown.
The equation for Reaction 1 is:
[ 2 \text{Fe}^{3+} + 3 \text{CO}_3^{2-} \rightarrow \text{Fe(OH)}_3 (s) + 3 \text{H}^+ ]
Step 2
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Step 5
Describe the different shapes of complexes and show how they lead to different types of isomerism.
Answer
Transition metal complexes can exhibit various shapes, including octahedral, tetrahedral, and square planar.
Octahedral Complexes
Octahedral complexes, such as [ \text{Co(H}_2 ext{O})_6^{3+} ], have six ligands arranged around a central metal ion. They may exhibit geometric isomerism, leading to cis and trans forms.
Tetrahedral Complexes
Tetrahedral complexes, such as [ \text{CoCl}_4^{2-} ], involve four ligands at the corners of a tetrahedron, which can also exhibit different types of isomerism, though less commonly due to symmetry constraints.
Square Planar Complexes
Square planar complexes, like [ \text{Pt(NH}_3)_2 ext{Cl}_2 ], can display cis-trans isomerism based on ligand arrangement around the central metal ion.
Structures
The structures of each type can be visually represented to enhance understanding of their geometric arrangements and isomeric forms.