DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ1.10a

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.2.HL.TZ1.10a
Level HL Paper 2 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 1]
23M.2.HL.TZ1.10a
(a)

Explain which form of the anthocyanin, X or Y, predominates at a pH of 12.

[1]

Markscheme

X AND «high pH moves» equilibrium left
OR
X AND loss of proton/H+ «at high pH/due to excess OH−(aq)»
OR
X AND positive ion unlikely «at high pH» ✓