DP Chemistry (first assessment 2025)

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Question 19N.2.HL.TZ0.5b(i)

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.HL.TZ0.5b(i)
Level	HL	Paper	2	Time zone	TZ0
Command term	Identify	Question number	b(i)	Adapted from	N/A

b(i).

[Maximum mark: 1]

19N.2.HL.TZ0.5b(i)

(b(i))

Identify the most suitable indicator for the titration using section 22 of the data booklet.

[1]

Markscheme

phenolphthalein ✔

NOTE: Accept phenol red.

Syllabus sections

Reactivity 3. What are the mechanisms of chemical change? » Reactivity 3.1—Proton transfer reactions » Reactivity 3.1.15—An appropriate indicator for a titration has an end point range that coincides with the pH at the equivalence point. Identify an appropriate indicator for a titration from the identity of the salt and the pH range of the indicator.