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Lesson: Water of Crystallization Chemistry

In this lesson, we will learn how to define water of crystallization and explain its effect on the structures, stabilities, and properties of crystals.

Lesson Plan

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).

Lesson Video

Lesson Worksheet

Q1:

How many molecules of water are there per unit of aluminum hydroxide in ?

Q2:

The diagram below shows a piece of equipment called a desiccator that is used to keep substances in a dry atmosphere. Why is the bottom of the desiccator lined with anhydrous calcium chloride?

Q3:

What name is given to a crystal that does not contain any water of crystallization?