DP Chemistry (last assessment 2024)

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Question 17N.2.hl.TZ0.1a

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.2.hl.TZ0.1a
Level hl Paper 2 Time zone TZ0
Command term Estimate Question number a Adapted from N/A
a.
[Maximum mark: 1]
17N.2.hl.TZ0.1a

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.

(a)

Using the graph, estimate the initial temperature of the solutions.

[1]

Markscheme

21.4 °C

Accept values in the range of 21.2 to 21.6 °C.
Accept two different values for the two solutions from within range.

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