DP Chemistry (last assessment 2024)
Question 22M.1.sl.TZ2.19
| Date | May 2022 | Marks available | [Maximum mark: 1] | Reference code | 22M.1.sl.TZ2.19 |
| Level | sl | Paper | 1 | Time zone | TZ2 |
| Command term | Solve | Question number | 19 | Adapted from | N/A |
19.
[Maximum mark: 1]
22M.1.sl.TZ2.19
Which of the 0.001 mol dm−3 solutions is most likely to have a pH of 11.3?
A. Ca(OH)2 (aq)
B. H3PO4 (aq)
C. NaOH (aq)
D. NH4OH (aq)
[1]
Markscheme
A
Examiners report
This required calculation of pH of a base – not an easy task for SL candidates without a calculator. 28% of the candidates answered the question correctly.