A-Level AQA 2024 Chemistry Paper 3

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A-level
CHEMISTRY
Paper 3

Friday 21 June 2024
Revision303 Morning
Revision303 Time allowed: 2Revision303
hours
Materials
For this paper you must have: For Examiner’s Use
• the Periodic Table/Data Booklet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
3
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside Section B
the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
this book. Write the question number against your answer(s).
• All working must be shown.
• Do all rough work in this book. Cross through any work you do not
want to be marked.

Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 90.

Advice
• You are advised to spend 70 minutes on Section A and 50 minutes on Section B.




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Answer all questions in this section.


0 1 The structure of 2-hydroxybenzenecarboxylic acid is shown.




0 1 . 1 Give the equation for the reaction of 2-hydroxybenzenecarboxylic acid with methanol.

In your equation, include the skeletal formula of the organic product.
[2 marks]




Revision303 Aspirin is produced from 2-hydroxybenzenecarboxylic
Revision303 acid by reaction with Revision303
ethanoic anhydride in the presence of concentrated phosphoric acid.

Method

1. Add 2-hydroxybenzenecarboxylic acid to a conical flask.
2. Add excess ethanoic anhydride.
3. Add a few drops of concentrated phosphoric acid.
4. Heat the flask to 85 °C for 10 minutes.
5. Cool the flask and pour the contents into 150 cm3 of cold water.
6. Filter and wash the impure solid aspirin.
7. Recrystallise the aspirin using a 50:50 mixture of water and ethanol.
8. Check the purity of the aspirin.


0 1 . 2 Aspirin can also be produced by reacting 2-hydroxybenzenecarboxylic acid with
ethanoyl chloride.

State why ethanoic anhydride is preferred to ethanoyl chloride for this preparation.
[1 mark]




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0 1 . 3 Give the name of the mechanism for the reaction of box

2-hydroxybenzenecarboxylic acid with ethanoic anhydride.
[1 mark]




0 1 . 4 Suggest the role of the concentrated phosphoric acid.
[1 mark]




0 1 . 5 Suggest why reflux is not essential when the flask is heated to 85 °C for 10 minutes.
[1 mark]




0 1 . 6 Complete and label the diagram to show how the impure solid is filtered.
[2 marks]



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Question 1 continues on the next page


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0 1 . 7 Suggest the identity of two impurities present in the filtered solid aspirin before it is box

washed in Step 6 of the method.
[2 marks]

Impurity 1

Impurity 2



0 1 . 8 Describe the recrystallisation process used to purify the aspirin.

Include the method and apparatus used.
[6 marks]




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