DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.c.iv

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.hl.TZ0.c.iv
Level hl Paper 2 Time zone TZ0
Command term Sketch Question number c.iv Adapted from N/A
c.iv.
[Maximum mark: 2]
22N.2.hl.TZ0.c.iv

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

A 0.20 mol dm−3 solution of ammonium nitrate is prepared.

Sketch the pH curve that would result from the titration of a 0.20 mol dm−3 solution of ammonium nitrate with sodium hydroxide.

 

[2]

Markscheme

non-symmetrical sigmoidal curve, starting pH 2–7 AND terminating pH>12 ✔

equivalence point pH approximately 11 AND at a volume 20 cm3 ✔

Examiners report

Most students managed to gain at least one mark, however it was a disappointing to see that many students did not use the information from the previous parts of the question to accurately inform their sketch. This question had a strong link between the mark and overall performance.

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