OCR A Level Chemistry pH, Acids and Buffers Workbook (A2, Year 13) with Mark Schemes

Try it free first: download the 10-page sample here: https://payhip.com/b/zchbO

pH and buffer calculations are long, multi-step and easy to lose marks on: a missing square root, the wrong moles after mixing, or a pH given to the wrong decimal places. This workbook builds each calculation one skill at a time, in the order students need them.

Each skill has five parts:

• Learn it: the rule, with full definitions and a road map for every calculation
• See it: worked examples in numbered steps, with calculator key sequences
• Check it: what OCR examiners say, with common mistakes and examiner tips
• Try it: questions that get harder as you go
• Try it: OCR exam style: questions with OCR wording and mark allocations, with "OCR twist" notes on the unfamiliar parts

The exam section is a 50-mark paper modelled on OCR's long pH calculations, including a six-mark level-of-response question. Every question has a full answer and an OCR-style mark scheme, with ECF, ALLOW / DO NOT ALLOW guidance and common errors. A "Where to go next" table sends students back to the skill they need.

Works on its own, or alongside the Chemistry Unlocked Acids revision cards: every skill names the matching card. Get both together in the bundle from my store: https://payhip.com/b/Rmhj5

Ideal for Year 13 independent study, homework, intervention, PAG 11 follow-up and mock preparation. Written for OCR A H432: 5.1.3 Acids, bases and buffers.

What's inside (51 pages):

1. Brønsted–Lowry acids, conjugate pairs and basicity
2. The role of H⁺: ionic equations for acid reactions
3. pH of strong acids and dilution
4. Ka and pKa
5. pH of weak acids and Ka from pH
6. Kw and the pH of strong bases
7. pH after mixing a strong acid and a strong base
8. Buffers: how they form and how they work
9. Buffer pH calculations
10. Practical: measuring pH and recording a pH titration curve (PAG 11)
11. Ka and pKa from the half-neutralisation point

Plus: skills tracker, a one-page summary of the four pH curve shapes, 50-mark exam paper, answers and mark schemes.

Licence: single user. Written for OCR A H432; not endorsed by OCR.