O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2023 · Q381 Mark

An organic compound, P, is dissolved in water. The concentration of the solution is 0.1 mol/dm³ and the pH is 3. A solid is added to the solution and effervescence is seen. Which equation could represent this reaction?

A2CH3CO2H(aq) + Mg(s) → (CH3CO2)2Mg(aq) + H2(g)

B2CH3CO2H(aq) + 2Mg(s) → 2CH3CO2Mg(aq) + H2(g)

C2CH3CO2H(aq) + K2CO3(s) → (CH3CO2)2K(aq) + CO2(g) + H2O(l)

D2HCl(aq) + K2CO3(s) → 2KCl(aq) + CO2(g) + H2O(l)

✓ Correct answer

A: 2CH3CO2H(aq) + Mg(s) → (CH3CO2)2Mg(aq) + H2(g)

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 38.

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