DP Chemistry (last assessment 2024)

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Question 22N.1.sl.TZ0.19

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.sl.TZ0.19
Level sl Paper 1 Time zone TZ0
Command term State Question number 19 Adapted from N/A
19.
[Maximum mark: 1]
22N.1.sl.TZ0.19

Equal volumes of 0.10 mol dm−3 weak acid and strong acid are titrated with 0.10 mol dm−3 NaOH solution. Which of these is the same for the two acids?


A.  Initial pH

B.  Heat evolved in the neutralization

C.  Volume of NaOH for complete neutralization

D.  Initial electrical conductivity

[1]

Markscheme

C

Examiners report

48% of the candidates deduced that the volume of NaOH required to neutralize the strong and weak acid samples would be the same. The most commonly chosen distractor was that the heat evolved would be the same. Surprisingly this question did not discriminate very well between high-scoring and low-scoring candidates. Some teachers commented that the question should have specified that the acids were monoprotic.

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