DP Chemistry (last assessment 2024)

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Question 22N.2.hl.TZ0.d.viii

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.hl.TZ0.d.viii
Level hl Paper 2 Time zone TZ0
Command term Deduce, Justify Question number d.viii Adapted from N/A
d.viii.
[Maximum mark: 1]
22N.2.hl.TZ0.d.viii

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

Cold packs contain ammonium nitrate and water separated by a membrane.

Deduce, with a reason, the position of the equilibrium.

[1]

Markscheme

product/right/solution/NH4NO3 (aq) is favoured AND K>1 ✔

 

Accept K large.

Accept other valid ways of justifying equilibrium position such as ΔG<0/spontaneous/ΔH<0 AND ΔS>0.

Examiners report

About 70% of candidates correctly assessed the equilibrium position corresponding to constant calculated, however quite a few candidates seemed to think that K>0, not K>1, was the criterion.

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