A-LevelChemistryChemical energetics9701/12 · May/June 2022 · Q101 Mark

Separate samples of 25.0 cm³ of 0.1 mol dm⁻³ NaOH(aq) are added to each of three different acid solutions, as described. The temperature of each of the solutions was 298 K before mixing. Which statement describes the temperature rises that occur on mixing each of these three acids separately with NaOH?

AThe temperature rise in all three mixtures is the same.

BThe temperature rise using H₂SO₄ and HCl is the same.

CThe temperature rise using CH₃CO₂H is greater than using HCl.

DThe greatest temperature rise occurs using H₂SO₄.

✓ Correct answer

D: The greatest temperature rise occurs using H₂SO₄.

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Topic: Chemical energetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2022 Paper 1 Variant 2, question 10.

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