Chemistry 0620 · IGCSE · Carboxylic acids

Carboxylic acids — practice question

The displayed structure is that of succinic acid.
(a(i))[1]

Circle one carboxylic acid functional group on the structure.

(a(ii))[1]

Work out the formula of succinic acid by showing how many carbon, hydrogen and oxygen atoms it has.

(b)[1]

When succinic acid is heated, it undergoes sublimation. State the meaning of sublimation.

(c(i))[1]

State the name of the $\text{-OH}$ functional group in compound F.

(c(ii))[1]

A polymer is made when succinic acid is heated with compound F. From the list, choose the word that best describes the small molecules that react to form a polymer: bases, ceramics, monomers, plastics.

(d)[2]

Ethanoic acid is another carboxylic acid. Describe the observations made when ethanoic acid reacts with blue litmus paper and calcium carbonate.

(e(i))[1]

Deduce the pH of the dilute ethanoic acid before any aqueous sodium hydroxide is added.

(e(ii))[1]

Deduce the volume of aqueous sodium hydroxide added when the solution is neutral.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: The COOH group is circled.

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