29 - 1AP Chemistry Lab Water of Hydration Brockport High...

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1 AP Chemistry Lab Brockport High School NY USA Water of Hydration Mr Keefer Objective: To study the properties of hydrates and determine the amount of water in a hydrated compound. Apparatus balance, Bunsen burner, small test tubes, crucible and cover, evaporating dish, clay triangle, tongs, goggles Chemicals hydrated compounds of cobalt (II) chloride, copper sulfate, potassium aluminum disulfate (alum), disodium carbonate Introduction Most solid chemical compounds will contain some water if they are exposed to the atmosphere. Some compounds contain larger amounts of water that is chemically bound to the crystal. This water is called water of hydration and is usually bound to the cations in the salt. The water molecules in a hydrate are removed easily by heating to a temperature above the boiling point of water. This often results in a color change for some compounds. Some hydrates, such as CoCl 2, lose water to the air in a process called efflorescence .
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