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CAIE IGCSE Chemistry Carboxylic Acid Reactions

Practise recognising carboxylic-acid structures and reactions with metals, bases and carbonates, as well as oxidation routes and ester formation.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • identify the carboxyl group and apply the general formula when naming or drawing an acid
  • predict salt-forming reactions with metals, bases and carbonates, including gas observations
  • form an ester from a named carboxylic acid and alcohol and draw the ester linkage

Covered syllabus points

11.7.1—Reaction of ethanoic acid11.7.2—Formation of ethanoic acid by the11.7.3—Reaction of a carboxylic acid with an

11.7 Carboxylic acids question 1

[Maximum number: 4]

Ethanol is manufactured by two methods:
method 1 fermentation of aqueous glucose
method 2 catalytic addition of steam to an alkene.

Question (a)

(a)

Ethanol can be converted to ethanoic acid by reacting it with an acidified oxidising agent.

[ 1 ]

Question (i)

(i)

Name the acidified oxidising agent.

[ 1 ]

Question (b)

(b)

Ethanoic acid reacts with calcium to form a salt and one other product.

[ 3 ]

Question (i)

(i)

Name the salt.

[ 1 ]

Question (ii)

(ii)

Write the formula of the salt.

[ 1 ]

Question (iii)

(iii)

Identify the other product.

[ 1 ]

11.7 Carboxylic acids question 2

[Maximum number: 3]

The table shows the structures of four hydrocarbons.

Table for Question 11.7 Carboxylic acids question 2 — CAIE IGCSE Chemistry

The structure shows an ester.

Figure for Question 11.7 Carboxylic acids question 2 — CAIE IGCSE Chemistry

Write the word equation for a reaction which could be used to make this ester.

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