DP Chemistry (last assessment 2024)

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

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

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.

(a)

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

[1]

Markscheme

21.4 °C

Accept values in the range of 21.2 to 21.6 °C.

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