Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Practical: making and testing the smell of some esters in the lab
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →State the role of sulfuric acid in the laboratory preparation of an ester. Explain why only a few drops are added.
Question 2
5 marks · Hard
Answer and see the solution →A student is asked to prepare a sample of butyl propanoate, an ester, using only laboratory equipment and chemicals available at school.
(a)[1 mark]Write the names of the alcohol and the carboxylic acid required to make butyl propanoate.
(b)[3 marks]Describe, in order, the main steps the student should follow to prepare and purify butyl propanoate in the laboratory.
(c)[1 mark]State how the student can safely test for the smell of the product once separated.
Question 3
2 marks · Hard
Answer and see the solution →During the purification step in ester preparation, the mixture is poured into sodium carbonate solution. Explain the purpose of this step and describe what you would observe.