Buffers (AQA A-Level Chemistry): Flashcards

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What do buffer solutions do?

Resist pH changes when small amounts of acid/base added

Acidic buffer components

Weak acid and its salt

Basic buffer components

Weak base and its salt

Acidic buffer pH range

Below 7

Basic buffer pH range

Above 7

Example: acidic buffer pair

Ethanoic acid & sodium ethanoate

In buffer, what neutralises added H+\text{H}^+?

Conjugate base (A−\text{A}^-)

pH of blood (maintained by buffers)

Around 7.4

Relationship: pKa\text{p}K_a to KaK_a

pKa=−log⁡Ka\text{p}K_a = -\log K_a

Formula: [H+][\text{H}^+] in buffer

Ka×[HA][A−]\frac{K_a \times [\text{HA}]}{[\text{A}^-]}

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Thermodynamics (A Level only)

Rate Equations (A Level only)

Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

Electrode Potentials & Electrochemical Cells (A Level only)

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Further Acids & Bases Calculations (A Level only)

Explore AQA A-Level Chemistry Exam Questions by Topics

Thermodynamics (A Level only)

Rate Equations (A Level only)

Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

Electrode Potentials & Electrochemical Cells (A Level only)

Fundamentals of Acids & Bases (A Level only)

Further Acids & Bases Calculations (A Level only)

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