Case study·Hard exam skill (4/5)·Calculator allowed
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
Two acid solutions are compared. Acid P has pH . Acid Q has pH . Both are monoprotic.
Total: 5 marks
(a) Which acid is stronger? (1 mark)
(b) Estimate for Q. (1 mark)
(c) Estimate degree of ionisation of Q. (2 marks)
(d) Explain why equal formal concentration does not imply equal pH. (1 mark)
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