Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
In a titration, the titres obtained after the rough trial are , and .
Total: 4 marks
(a) Which readings should be used for the mean titre? (1 mark)
(b) Find the mean titre. (1 mark)
(c) State the endpoint colour. (1 mark)
(d) Give one precaution while taking burette readings. (1 mark)
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