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Amines (A-level only)

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Question 9

This question is about the preparation of an ester.

Ester HHH can be prepared from propan-1-ol and ethanoic acid.

a.

Give a balanced chemical equation for this reaction using condensed structural formulas, and state the IUPAC name of ester HHH.

[2]
b.

The following method is used to prepare a pure sample of ester HHH:

  • Step 1: Mix 10 cm310\text{ cm}^310 cm3 of propan-1-ol with 12 cm312\text{ cm}^312 cm3 of ethanoic acid in a reaction flask. Add 555 drops of concentrated sulfuric acid and some anti-bumping granules. Assemble the reflux chemistry apparatus and heat the mixture.
  • Step 2: Transfer the cooled mixture to a separating funnel. Add 20 cm320\text{ cm}^320 cm3 of aqueous sodium hydrogencarbonate, stopper the funnel, and shake the mixture.
  • Step 3: Run off the organic layer into a beaker, add anhydrous sodium sulfate, and decant the liquid.
  • Step 4: Purify the ester using distillation.

Answer the following questions based on this preparation method:

  1. Explain the purpose of adding anti-bumping granules in Step 1.
  2. State the purpose of adding aqueous sodium hydrogencarbonate in Step 2.
  3. Suggest a precaution (with a reason) that should be taken while shaking the mixture in the separating funnel in Step 2.
  4. State the function of the anhydrous sodium sulfate in Step 3.
  5. Suggest how the purity of ester HHH can be confirmed during or after the distillation in Step 4.
[6]
Markscheme

Amines (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Amines (A-level only)

26 exam-style questions on AQA A Level Chemistry Amines (A-level only), covering Preparation (A-level only), Base properties (A-level only), and Nucleophilic properties (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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