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Lesson Plan: Degree of Dissociation Chemistry • Third Year of Secondary School
This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to define and calculate the degree of dissociation of a weak acid and use it to derive Ostwald’s law of dilution.
Objectives
Students will be able to
- explain and calculate the degree of dissociation of a weak acid,
- write equations for the dissociation constant (Ka) in terms of volume and degree of dissociation,
- state and derive Ostwald’s law of dilution and the relationship between Ka, degree of dissociation, the volume,
- calculate Ka for a weak acid from the initial concentration and degree of dissociation and vice versa,
- explain the relationship between the degree of dissociation and dilution (either through volume or concentration),
- explain the effect the degree of dissociation of electrolytes has on the electrical conductivity of a solution.
Prerequisites
Students should already be familiar with
- acid dissociation constants,
- weak acids.
Exclusions
Students will not cover
- molar conductivities.
