DP Chemistry (first assessment 2025)

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Question 20N.1B.SL.TZ0.b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1B.SL.TZ0.b
Level SL Paper 1B Time zone TZ0
Command term Suggest Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.1B.SL.TZ0.b

Aspirin crystals are rinsed with water after recrystallization to remove impurities.
Suggest why cold water is used.

[1]

Markscheme

to avoid dissolving the crystals/aspirin ✔

Accept “to avoid loss of product” OR “aspirin is less soluble in cold water”.

Examiners report

Many were unable to explain why aspirin should be washed with cold water, namely, to avoid dissolving crystals. Surprisingly, the incorrect term "melt" was frequently used instead of "dissolve".

Syllabus sections