DP Chemistry (last assessment 2024)
Question 20N.2.hl.TZ0.5f(i)
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.2.hl.TZ0.5f(i) |
| Level | hl | Paper | 2 | Time zone | TZ0 |
| Command term | State | Question number | f(i) | Adapted from | N/A |
f(i).
[Maximum mark: 1]
20N.2.hl.TZ0.5f(i)
A student performs a titration to determine the concentration of ethanoic acid, , in vinegar using potassium hydroxide.
(f(i))
Potassium hydroxide solutions can react with carbon dioxide from the air. The solution was made one day prior to using it in the titration.
State the type of error that would result from the student’s approach.
[1]
Markscheme
systematic «error» ✔
Examiners report
80% of candidates could identify the method used as a systematic error, with some stating human or random error.
