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page 1 of 2 2uch core Water of Crystallization Water of Crystallization Many salts crystallize with a fixed ratio of water in the salt. The water in the crystal is called the water of crystallization. The purpose of this experiment is to determine this fixed ratio in sodium carbonate hydrate (called soda). The water of crystallization is driven off when heated: Na 2 CO 3 ∙ 𝑥 H 2 O(s) → Na 2 CO 3 (s) + 𝑥 H 2 O (g) The salt is weighed before and after heating. The decrease in mass is the mass of water in the crystal while the final mass is the mass of the anhydrous sodium carbonate. Apparatus and Chemicals Crucible with lid, tongs, tripod, clay triangle, Bunsen burner, evaporating dish (or crystallization dish), balance, sodium carbonate with water of crystallization (soda) Procedure 1. Clean the crucible and lid. 2. Heat the crucible and lid. (See Figure 1). Leave the lid slightly opened. 3. When the bottom of the crucible is red hot, turn off the Bunsen burner.

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