DP Chemistry (last assessment 2024)

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Question 22M.1.hl.TZ2.24

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.1.hl.TZ2.24
Level hl Paper 1 Time zone TZ2
Command term Apply Question number 24 Adapted from N/A
24.
[Maximum mark: 1]
22M.1.hl.TZ2.24

What happens to the amount of hydroxide ions and hydroxide ion concentration when water is added to a solution of NH3 (aq)?

[1]

Markscheme

C

Examiners report

35% of the candidates deduced the change in amount of OH- and [OH-] when water is added to NH3(aq). The majority of candidates recognized the increase in the amount of OH- due to the shift in the equilibrium position but assumed that the concentration of OH- increased as well ignoring the effect of the dilution. Some teachers commented that this question was too complicated.

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