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CAIE A Level Chemistry 9701 · Carboxylic acids and derivatives

Carboxylic acids and derivatives: explain question

Explain6 marksChallenge

A student prepares the ester ethyl ethanoate by reacting ethanol with ethanoic acid in the presence of concentrated sulfuric acid. A second sample of ethyl ethanoate is divided into two portions. One portion is heated under reflux with dilute hydrochloric acid; the other is heated under reflux with dilute sodium hydroxide solution.

Explain the role of the concentrated sulfuric acid in the formation of ethyl ethanoate, and compare the products of the two hydrolysis reactions.

0 words · 6 marks

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6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.

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