Chemistry 5070 · O Level · Carboxylic acids

Carboxylic acids — practice question

Methanoic acid and ethanoic acid belong to the group of weak acids.
(a)[1]

What is meant by the word weak when it is used to describe acids?

(b(i))[1]

Methanoic acid, $\text{HCO}_2\text{H}$, reacts with magnesium powder. Write the equation for this reaction.

(b(ii))[2]

State and explain how the rate of this reaction is altered when the test is repeated with a magnesium ribbon piece that has the same mass as the powder. Keep all other conditions unchanged. Your answer should refer to collisions between particles.

(c)[2]

Methanoic acid reacts with propanol, $\text{C}_3\text{H}_7\text{OH}$, to make an ester. Give the name of this ester and draw its structure, showing every atom and every bond.

(d(i))[1]

Name the organic compound that is changed into ethanoic acid during vinegar production.

(d(ii))[1]

What kind of chemical reaction is this?

(e(i))[1]

Predict the density of ethanoic acid.

(e(ii))[1]

Describe and explain how the boiling point changes as the number of carbon atoms in a molecule increases.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: an acid that is partially/slightly ionised or dissociated in water

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