DP Chemistry (first assessment 2025)

Question 23M.1A.SL.TZ2.27

Date	May 2023	Marks available	[Maximum mark: 1]	Reference code	23M.1A.SL.TZ2.27
Level	SL	Paper	1A	Time zone	TZ2
Command term		Question number	27	Adapted from	N/A

27.

[Maximum mark: 1]

23M.1A.SL.TZ2.27

The ionic product constant of water, K_w, is 3 × 10⁻¹⁵ at 10 °C and 5 × 10⁻¹³ at 98 °C. What is true about the hydrogen and hydroxide ion concentrations when pH = 7 at these temperatures?

	pH = 7 at 10 °C	pH = 7 at 98 °C
A.	[H⁺] = [OH⁻]	[H⁺] = [OH⁻]
B.	[H⁺] > [OH⁻]	[H⁺] > [OH⁻]
C.	[H⁺] < [OH⁻]	[H⁺] > [OH⁻]
D.	[H⁺] > [OH⁻]	[H⁺] < [OH⁻]

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Question 23M.1A.SL.TZ2.27

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