DP Chemistry (last assessment 2024)

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Question 17N.2.sl.TZ0.d.i

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.2.sl.TZ0.d.i
Level sl Paper 2 Time zone TZ0
Command term Determine Question number d.i Adapted from N/A
d.i.
[Maximum mark: 2]
17N.2.sl.TZ0.d.i

A student titrated an ethanoic acid solution, CH3COOH (aq), against 50.0 cm3 of 0.995 mol dm–3 sodium hydroxide, NaOH (aq), to determine its concentration.

The temperature of the reaction mixture was measured after each acid addition and plotted against the volume of acid.

Determine the heat change, q, in kJ, for the neutralization reaction between ethanoic acid and sodium hydroxide.

Assume the specific heat capacities of the solutions and their densities are those of water.

[2]

Markscheme

«total volume = 50.0 + 26.0 =» 76.0 cm3 AND «temperature change 29.0 – 21.4 =» 7.6 «°C»

«q = 0.0760 kg x 4.18 kJ kg–1 K–1 x 7.6 K =» 2.4 «kJ»

Award [2] for correct final answer.

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