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Weak acids, buffers and titration curves · A Level Chemistry · Courselo

Courselo

Chemistry
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Physical chemistry: energetics, kinetics and equilibria

Weak acids, buffers and titration curves

Physical chemistry: energetics, kinetics and equilibria · Lesson 9 of 10

Lesson 9 of 10

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Unit 2

Physical chemistry: energetics, kinetics and equilibria

10 lessons · 16 h 45 min of study

Enthalpy changes and calorimetry1 h 30 min of study
Hess cycles, bond enthalpies and lattice energetics2 h of study
Entropy and Gibbs free energy1 h 45 min of study
Reaction rates and collision theory1 h 15 min of study
Rate equations, orders, mechanisms and Arrhenius treatment2 h 30 min of study
Dynamic equilibrium and Le Chatelier’s principle

This unit is ≈20% of the Chemistry, across 10 lessons. Full syllabus

Lesson 9 of 10 · Physical chemistry: energetics, kinetics and equilibria

Weak acids, buffers and titration curves

3 quick checks≈2% of the testStretch: Stretch: harder material that separates the top grades

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By the end you’ll be able to

Define acid dissociation constant $K_a$ and use it to compare the strengths of weak acids, including use of $\text{p}K_a$ where specified.
Calculate the pH of a weak acid solution from concentration and $K_a$, using appropriate approximations where justified by the specification.

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Adaptive questions on weak acids, buffers and titration curves.

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1 h 15 min of study

Equilibrium constants Kc and Kp1 h 45 min of study

Acids, bases and pH calculations1 h 45 min of study

Weak acids, buffers and titration curvesReading · 0%

Solubility product and precipitation equilibria1 h of study

Explain the action of a buffer solution in terms of equilibrium and the presence of a weak acid with its conjugate base, or a weak base with its conjugate acid where relevant.

Calculate the pH of buffer solutions from component concentrations and acid dissociation data using the required equilibrium relationships.

Interpret and sketch titration curves for strong acid-strong base, weak acid-strong base and other required combinations, identifying key regions such as initial pH, buffer region, equivalence point and end point.

Select a suitable indicator from titration-curve information and explain the choice in terms of indicator transition range and steepness of pH change.

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