DP Chemistry (last assessment 2024)

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Question 22M.2.hl.TZ1.1d(ii)

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ1.1d(ii)
Level hl Paper 2 Time zone TZ1
Command term Identify Question number d(ii) Adapted from N/A
d(ii).
[Maximum mark: 1]
22M.2.hl.TZ1.1d(ii)

When heated in air, magnesium ribbon reacts with oxygen to form magnesium oxide.

The presence of magnesium nitride can be demonstrated by adding water to the product. It is hydrolysed to form magnesium hydroxide and ammonia.

(d(ii))

Ammonia is added to water that contains a few drops of an indicator. Identify an indicator that would change colour. Use sections 21 and 22 of the data booklet.

[1]

Markscheme

phenol red ✔


Accept bromothymol blue or phenolphthalein.

Examiners report

Well done; some chose bromocresol green or methyl red as the indicator that would change colour, instead of phenol red, bromothymol blue or phenolphthalein.

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