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) → [Fe(H2O)6]3+ Reaction 3 [Fe(H2O)6]2+ → Reaction 4 Concentrated NH3(aq) → Precipitate M 1. Give the formula of Precipitate J and state its colour. Give an equation for Reaction 1. 2. Give the formula of L and an equation for Reaction 2. 3. Suggest a reagent for Reaction 3. 4. Give the formula of Precipitate M and state its colour. 5. Transition metal complexes have different shapes and many show isomerism. Describe the different shapes of complexes and show how they lead to different types of isomerism. Use examples of complexes of cobalt(II) and platinum(II). You should draw the structures of the examples chosen.

A-Level AQA Chemistry Chemical Equilibria, Le Chateliers Principle & Kc: Figure 3 shows some reactions of

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) → [Fe(... 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.

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Answer

The formula of Precipitate J is $Fe(OH)_{3}$ , which is typically described as brown in colour.

The equation for Reaction 1 is:

$2Fe^{3+}(aq) + 3CO_{3}^{2-}(aq) → 2Fe(OH)_{3}(s) + 3H^{+}(aq)$

Step 2

Give the formula of L and an equation for Reaction 2.

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Answer

The formula of Complex ion L is $[Fe(H_2O)_{6}]^{3+}$ .

The equation for Reaction 2 is:

$Fe(OH)_{3}(s) + 6HCl(aq) → [Fe(H_2O)_{6}]^{3+}(aq) + 6Cl^{-}(aq)$

Step 3

Suggest a reagent for Reaction 3.

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Answer

A suitable reagent for Reaction 3 is $[Cl^{-}]$ or Potassium iodide.

Step 4

Give the formula of Precipitate M and state its colour.

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Answer

The formula of Precipitate M is $Fe(OH)_{2}$ , which is typically described as green in colour.

Step 5

Describe the different shapes of complexes and show how they lead to different types of isomerism.

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Answer

Transition metal complexes can exhibit a variety of shapes such as octahedral, tetrahedral, and square planar.

1. Octahedral complexes

Examples include $[Co(NH_3)_{6}]^{3+}$ which can show cis- and trans-isomerism based on the positioning of ligands around the metal center.

2. Tetrahedral complexes

An example would be $[CoCl_{4}]^{2-}$ , which does not exhibit geometric isomerism due to its symmetry.

3. Square planar complexes

For example, ${[Pt(NH_3)_{2}Cl_{2}]}^{2+}$ can show cis- and trans-isomerism, where ligands can be positioned adjacent or opposite to each other.

Diagrams illustrating these shapes can be constructed to visualize the isomerism.

Figure 3 shows some reactions of aqueous iron ions - AQA - A-Level Chemistry - Question 4 - 2019 - Paper 1

Worked Solution & Example Answer:Figure 3 shows some reactions of aqueous iron ions - AQA - A-Level Chemistry - Question 4 - 2019 - Paper 1

Give the formula of Precipitate J and state its colour. Give an equation for Reaction 1.

Give the formula of L and an equation for Reaction 2.

Suggest a reagent for Reaction 3.

Give the formula of Precipitate M and state its colour.

Describe the different shapes of complexes and show how they lead to different types of isomerism.

1. Octahedral complexes

2. Tetrahedral complexes

3. Square planar complexes

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