DP Chemistry (last assessment 2024)

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Question 22N.1.hl.TZ0.26

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1.hl.TZ0.26
Level hl Paper 1 Time zone TZ0
Command term Identify Question number 26 Adapted from N/A
26.
[Maximum mark: 1]
22N.1.hl.TZ0.26

Which solutions will form a buffer when mixed?


A.  50 cm3 of 1.0 mol dm−3 HCl and 50 cm3 of 1.0 mol dm−3 NaOH

B.  50 cm3 of 1.0 mol dm−3 CH3COOH and 50 cm3 of 1.0 mol dm−3 NaOH

C.  50 cm3 of 1.0 mol dm−3 CH3COOH and 100 cm3 of 1.0 mol dm−3 NaOH

D.  100 cm3 of 1.0 mol dm−3 CH3COOH and 50 cm3 of 1.0 mol dm−3 NaOH

[1]

Markscheme

D

Examiners report

Over 70% of candidates answered correctly, realising that partial neutralization of a weak acid by a strong base produces a buffer solution and there was quite a strong link with overall performance. Complete neutralization to give the salt (B) was the most frequently chosen distractor.

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