Reaction Of Ions In Aqueous Solution

Question 1

This question is about iron and its ions.
(a) Discuss the role of iron as a heterogeneous catalyst in the Haber process.
3 H2 + N2 = 2 NH3
Your answer should include:
the meaning of the term heterogeneous catalyst how iron acts as a heterogeneous catalyst
the factors that affect the efficiency and lifetime of the catalyst.

Answer 1

Stage 1
1a Heterogeneous means in a different phase/state from reactants
1b Catalyst speeds up reaction and is left unchanged OR lowers the activation energy for the reaction
Stage 2
2a Hydrogen and nitrogen/reactants adsorb onto the surface/ active sites of the iron
2b Bonds weaken/reaction takes place
2c Products desorb/leave from the surface (of the iron)
Stage 3
3a Large surface area (of iron) by using powder or small pellets or support medium/mesh
3b Catalyst poisoned / sulfur poisons or binds to the catalyst
3c Active sites blocked

Question 2

Give the formula of the complex ion C.
State one condition needed for the formation of C from [AI(H20)]3+(aq) and NaOH(aq).
Give an equation for this reaction.

Give formula of C
Condition
Equation

Answer 2

Question 3

Explain, with the use of an equation, why a solution containing [AI(H20)]3+ has a pH <7

Answer 3

Question 4

Suggest a reagent for reaction 3

Answer 4

Zn (in acid/H2SO4/HCl)

Question 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(Il) and platinum(II).
You should draw the structures of the examples chosen.

Answer 5

Question 6

Answer 6