plumiPreparing a transition metal complex (Core Practical 14): Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 17.3.3 Preparing a transition metal complex (Core Practical 14), 2019–2025, with mark schemes and examiner’s reports where available.
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Q2(a)
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All 9 questions on Preparing a transition metal complex (Core Practical 14), as a list
- June 2021, Unit 6, Q2(a) (1 mark): Give a reason why a measuring cylinder is more suitable than a graduated pipette for measuring the distilled water in Step 1. (1)
- June 2021, Unit 6, Q2(b) (1 mark): Give the colour of the solution at the end of Step 2. (1)
- June 2021, Unit 6, Q2(c) (1 mark): Give the reason why Step 2 should be carried out in a fume cupboard. (1)
- June 2021, Unit 6, Q2(d) (1 mark): Give the reason why the addition of ethanol in Step 3 results in the precipitation of crystals of Cu(NH3)4SO4.H2O. (1)
- June 2021, Unit 6, Q2(e) (3 marks): Draw a labelled diagram of the apparatus used to filter the crystals under reduced pressure in Step 4. (3)
- June 2021, Unit 6, Q2(f)(i) (1 mark): State the purpose of the ethanol in Step 5. (1)
- June 2021, Unit 6, Q2(f)(ii) (1 mark): Give a reason why the ethanol is cold. (1)
- June 2021, Unit 6, Q2(g)(i) (3 marks): Calculate the apparent percentage yield of Cu(NH3)4SO4.H2O. Give your answer to an appropriate number of significant figures. (3)
- June 2021, Unit 6, Q2(g)(ii) (1 mark): Suggest a reason why the apparent percentage yield in this preparation is often greater than 100 %. (1)
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