Chemistry 5070 · O Level · The characteristic properties of acids and bases

The characteristic properties of acids and bases — practice question

Ethanoic acid, $\text{CH}_3\text{COOH}$, is classified as a weak acid.
(a)[1]

What is meant by the term weak when it is used for acids?

(b)[2]

Ethanoic acid is solid at $16.0^\circ\text{C}$. Describe how the particles are arranged and how they move in a solid.

(c)[1]

Ethanoic acid has a melting point of $16.7^\circ\text{C}$. Ethanoic acid has a boiling point of $118.0^\circ\text{C}$. Deduce the physical state of ethanoic acid at $130.0^\circ\text{C}$. Explain your answer.

(d)[3]

The equation for the reaction of ethanoic acid with sodium carbonate is shown. $\text{2CH}_3\text{COOH} + \text{Na}_2\text{CO}_3 \rightarrow \text{2CH}_3\text{COONa} + \text{CO}_2 + \text{H}_2\text{O}$ A student added $3.18\,\text{g}$ of sodium carbonate to $224\,\text{cm}^3$ of $0.250\,\text{mol dm}^{-3}$ ethanoic acid. Show by calculation that sodium carbonate is in excess.

(e)[1]

Calcium reacts with ethanoic acid. The products are calcium ethanoate and hydrogen. Write the equation for this reaction.

(f(i))[1]

Name the ester produced when ethanoic acid reacts with butanol.

(f(ii))[1]

Draw the structure of this ester.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: acid does not ionise completely / partially dissociated

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