| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.sl.TZ1.30 |
| Level | SL | Paper | 1 | Time zone | TZ1 |
| Command term | Identify | Question number | 30 | Adapted from | N/A |
Question
Which would be the best method to decrease the random uncertainty of a measurement in an acid–base titration?
A. Ensure your eye is at the same height as the meniscus when reading the burette.
B. Use a different indicator for the titration.
C. Use a different burette.
D. Repeat the titration.
Markscheme
D
Examiners report
One respondent stated in the G2 form that the answer could be A. In the teacher’s notes of assessment statement 11.1.3 it is stated that “random uncertainties are reduced by repeating readings”. 75.05% of the candidates chose the correct answer D with only 16.05% opting for A. This proved to be the sixth easiest question of the paper with a discrimination index of 0.20.
Syllabus sections
Core » Topic 11: Measurement and data processing » 11.1 Uncertainties and errors in measurement and results
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