Lesson Plan: Water of Crystallization Chemistry

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to define water of crystallization and explain its effect on the structures, stabilities, and properties of crystals.


Students will be able to

  • define and understand the term water of crystallization,
  • understand that salts can be hydrated or anhydrous,
  • understand the use of dot notation to express water of crystallization,
  • calculate the stoichiometry of a hydrated crystal based on hydrated and dehydrated masses of a crystal,
  • connect the loss of mass of a hydrated crystal with the loss of water molecules from the crystal,
  • describe in brief the properties of different hydrates (e.g., efflorescence, hygroscopicity).


Students should already be familiar with

  • salts,
  • chemical formulas.


Students will not cover

  • deliquescent compounds,
  • the crystal structure of hydrated crystals.

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