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CAIE A Level Chemistry 9701 · Carboxylic acids and derivatives

Carboxylic acids and derivatives: describe question

Describe7 marksChallenge

A student prepares the ester ethyl ethanoate by heating a mixture of ethanol and ethanoic acid with concentrated sulfuric acid.

(a) Name the type of reaction and state the role of the concentrated sulfuric acid.

(b) The student then hydrolyses a sample of the ester. Describe how the hydrolysis is carried out using dilute alkali and heat, and state the products formed.

(c) The student repeats the hydrolysis using dilute acid instead of dilute alkali. State how the method differs and give a reason for this difference.

0 words · 7 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

7 marks, so the mark scheme is looking for about 7 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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