IB Chemistry HL · 2025
6.1 Proton transfer reactions
46 past paper questions from 11 papers across 3 exam sessions. See what repeats, then practise the same skills with AI marking.
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HL archive · 2025 to 2026
6.1 Proton transfer reactions
Latest exam session: May 2026
- questions
- 46
- questions
- papers
- 11
- papers
- exam sessions
- 3
- exam sessions
- micro-topics
- 5
Micro-topics in 6.1 Proton transfer reactions
In syllabus order. The ring is the share of papers each appears in.
6.1.1
Brønsted–Lowry acids and bases
10 questions · in 73% of papersAppears in 8 of the 11 Chemistry HL papers analysed (73%), at least once each.
Frequently testedlast May 26 P1 TZA
6.1.2
The pH scale and strong vs weak acids and bases
7 questions · in 64% of papersAppears in 7 of the 11 Chemistry HL papers analysed (64%), at least once each.
Frequently testedlast Nov 25 P1 TZ3
6.1.3
6 questions · in 45% of papersAppears in 5 of the 11 Chemistry HL papers analysed (45%), at least once each.
Frequently testedlast May 26 P1 TZA
6.1.4
Ka, Kb, pKa and the pH of weak acids (HL)
6 questions · in 55% of papersAppears in 6 of the 11 Chemistry HL papers analysed (55%), at least once each.
Frequently testedlast Nov 25 P2 TZ3
6.1.5
Buffers, pH curves and indicators (HL)
17 questions · in 82% of papersAppears in 9 of the 11 Chemistry HL papers analysed (82%), at least once each.
Frequently testedlast Nov 25 P2 TZ3
Exam pattern
How often each micro-topic has been examined, year by year. Each label is explained under the grid.
Does it repeat?
Top 4 of 5 micro-topics for the next sitting. Numbers are questions per year.
fewermore
| Micro-topic | 2025 | 2026 |
|---|---|---|
| 17Buffers, pH curves and indicators (HL), 2025: 17 questions | ·Buffers, pH curves and indicators (HL), 2026: 0 questions | |
| 9Brønsted–Lowry acids and bases, 2025: 9 questions | 1Brønsted–Lowry acids and bases, 2026: 1 question | |
| 7The pH scale and strong vs weak acids and bases, 2025: 7 questions | ·The pH scale and strong vs weak acids and bases, 2026: 0 questions | |
| 6Ka, Kb, pKa and the pH of weak acids (HL), 2025: 6 questions | ·Ka, Kb, pKa and the pH of weak acids (HL), 2026: 0 questions |
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- Frequently testedin at least a quarter of all papers, and still appearing in the last two years
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Questions on 6.1 Proton transfer reactions, by exam session
Which papers asked about 6.1 Proton transfer reactions, and which question numbers. Open a paper to see them highlighted.
May 2026
2 questions across 1 paper
November 2025
8 questions across 4 papers
May 2025
19 questions across 6 papers
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Frequently asked questions
Short answers about this page.
Which Chemistry HL exam sessions are covered for 6.1 Proton transfer reactions?
3 exam sessions from 2025 to 2026, the latest May 2026. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 11 papers in this archive.
Which 6.1 Proton transfer reactions topic comes up most?
Buffers, pH curves and indicators (HL) (6.1.5): in 82% of papers, last seen Nov 25 P2 TZ3. Usually "identify", worth about 3.1 marks in a paper that includes it.
Can I see the original question and mark scheme?
No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.
What do "banker", "due" and "rising" mean?
Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.
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