DP Chemistry (last assessment 2024)

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Question 19M.1.sl.TZ2.19

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.sl.TZ2.19
Level sl Paper 1 Time zone TZ2
Command term Question number 19 Adapted from N/A
19.
[Maximum mark: 1]
19M.1.sl.TZ2.19

What is the pH of 0.001 mol dm−3 NaOH (aq)?

A. 1

B. 3

C. 11

D. 13

[1]

Markscheme

C

Examiners report

The question discriminated well between high scoring and low scoring candidates. 58 % of the candidates were able to calculate the pH of the aqueous solution of NaOH. The most commonly chosen distractor was B (pH = 3) where the students determined pOH but did not complete the calculation. It is interesting that these candidates did not seem to notice that NaOH is a base and should have a higher pH.

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