DP Chemistry (last assessment 2024)
Question 20N.2.hl.TZ0.5b(ii)
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.2.hl.TZ0.5b(ii) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | b(ii) | Adapted from | N/A |
b(ii).
[Maximum mark: 1]
20N.2.hl.TZ0.5b(ii)
A student performs a titration to determine the concentration of ethanoic acid, , in vinegar using potassium hydroxide.
The pH curve for the reaction is given.
(b(ii))
State a suitable indicator for this titration. Use section 22 of the data booklet
[1]
Markscheme
phenolphthalein ✔
Accept “phenol red” or “bromothymol blue”.
Examiners report
Almost all candidates could identify a suitable indicator to use in a titration of a weak acid with a strong base.
