Cambridge AS & A Level Chemistry
25.1Acids and bases
Acids and bases in Cambridge AS & A Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic84 practice questions4 lessons
Overview
Conjugate acid-base pairs (25.1.1-25.1.2) are taught in the Brønsted-Lowry lesson (7.2).
Learning objectives
What the syllabus expects you to be able to do.
- 25.1.1Use the terms conjugate acid and conjugate base.
- 25.1.2Identify conjugate acid-base pairs in reactions.
- 25.1.3Define pH, Ka, pKa and Kw and use them in calculations (Kb is not tested).
- 25.1.4Calculate [H⁺] and pH for strong acids, strong alkalis and weak acids.
- 25.1.5Define a buffer, explain how it is made and how it controls pH, and describe uses including HCO₃⁻ in blood.
- 25.1.6Calculate the pH of buffer solutions.
- 25.1.7Use the term solubility product, Ksp.
- 25.1.8Write Ksp expressions.
- 25.1.9Calculate Ksp from concentrations and vice versa.
- 25.1.10Explain and calculate the common ion effect.
Lessons
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Buffer solutions
50 min
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pH, pOH and the ionic product of water
45 min
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Solubility product and the common ion effect
45 min
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Weak acids and bases: Ka, pKa, Kb and pKb
35 min
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Sample question
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