Transition metal Complex:

Question 1

outline the method for the preparation of a transition metal complex: (6) e.g. copper

Answer 1

1. calculate mass of copper sulphate. dissolve in water.
2. add conc. ammonia in a fume cupboard.
3. stir and pour into ethanol. then cool in ice bath. crystals form.
4. filter using a Buchner funnel - collecting crystals in the funnel.
5. was tube with cold ethanal and add the washings.
6. remove crystals and pat dry between two filter papers. record the mass of the dry crystals.

Question 2

what is hydrated copper sulphate harmful to?

Answer 2

aquatic life.

Question 3

why might mass be lower than expected?

Answer 3

reaction not going to completion - product staying in solution and not crystallising out.

Question 4

why might mass be higher than expected?

Answer 4

not dry enough crystals:

- water/ethanol adding to the final mass.

Question 5

why is [FeF6]3- colourless?

Answer 5

• strong interactions between F- ligands.
• d-d energy gap is large.
• so frequency absorbed is not in the visible region.
• U.V.