DP Chemistry (last assessment 2024)

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Question 17N.2.hl.TZ0.b

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

A student titrated two acids, hydrochloric acid, HCl (aq) and ethanoic acid, CH3COOH (aq), against 50.0 cm3 of 0.995 mol dm–3 sodium hydroxide, NaOH (aq), to determine their concentration. The temperature of the reaction mixture was measured after each acid addition and plotted against the volume of each acid.

Determine the maximum temperature reached in each experiment by analysing the graph.

[2]

Markscheme

HCl: 30.4 «°C»

Accept range 30.2 to 30.6 °C.


CH3COOH: 29.0 «°C»

Accept range 28.8 to 29.2 °C.

Syllabus sections