Lesson Plan: Degree of Dissociation Chemistry

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.


Students will be able to

  • explain and calculate the degree of dissociation (𝛼) 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.


Students should already be familiar with

  • acid dissociation constants,
  • weak acids.


Students will not cover

  • molar conductivities.

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