DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ2.22a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ2.22a
Level hl Paper 3 Time zone TZ2
Command term Predict Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.hl.TZ2.22a

A student synthesized aspirin, acetylsalicylic acid, in a school laboratory.

(a)

Predict one absorption band present in an infrared (IR) spectrum of aspirin, using section 26 of the data booklet.

[1]

Markscheme

Any one of:
1050–1410 «cm–1 due to C–O»  [✔]
1700–1750 «cm–1 due to C=O in acids and esters» [✔]
2500–3000 «cm–1 due to O–H in acids» [✔]
2850–3090 «cm–1 due to C–H in alkanes and arenes» [✔]

Examiners report

This was a very well answered question. Even weak candidates were able to identify one correct absorption band present in an infrared spectrum of aspirin.

Syllabus sections