DP Chemistry (first assessment 2025)

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Question SPM.1A.HL.TZ0.33

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.33
Level HL Paper 1A Time zone TZ0
Command term Question number 33 Adapted from N/A
33.
[Maximum mark: 1]
SPM.1A.HL.TZ0.33

The indicator, HInd, is used in an acid–base titration.

HInd (aq) ⇌ H+ (aq) + Ind− (aq)

colour A               colour B


Which statements are correct?


I.  In a strongly alkaline solution, colour B is observed.
II.  Colour A is observed when [HInd] < [Ind−].
III.  [Ind−] approximately equals [HInd] at the end point.


A.  I and II only

B.  I and III only

C.  II and III only

D.  I, II and III

[1]

Markscheme

B