Chapter 3: Acids, pH, Ka and Buffers

A-level ChemistryModule 5: Physical Chemistry & Transition Elements9 topicsHigher

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alevel · chemistry · Module 5: Physical Chemistry & Transition Elements · All papers

Releases 1 August 2026

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Module 5: Physical Chemistry and Transition Elements: Acids, pH, Ka and Buffers - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

standard / hard

6 marksdescribestandardOCR A

For Acids, pH, Ka and Buffers, describe how weak acids, Ka, pH and buffer action applies to ethanoic acid titrated with sodium hydroxide.

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6 markscalculatehardOCR A

Using ethanoic acid titrated with sodium hydroxide, calculate a relevant OCR A Acids, pH, Ka and Buffers quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Acids, pH, Ka and Buffers: Volume of sodium hydroxide added (cm3) vs pH (pH unit)

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The graph for Acids, pH, Ka and Buffers shows data from ethanoic acid titrated with sodium hydroxide. Explain the pattern using the data and relevant chemistry principles.

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6 marksevaluatestandardOCR A

In ethanoic acid titrated with sodium hydroxide, evaluate the experimental method or model assumptions used when applying weak acids, Ka, pH and buffer action.

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2. Equilibrium, Kc, Kp and Industrial Compromise

4. Enthalpy, Entropy and Gibbs Free Energy

Key learning objectives

Understand the key principles behind Acids, pH, Ka and Buffers.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.