Converting bubbles into powder
Objective: Obtain a precipitate inside the carbonated water
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Laboratory materials
Test tubes
Beakers
Pipettes
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Reagents
Calcium hydroxide (Ca(OH)2)
Carbonated water
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Safety
Don't forget the gloves, lab coat, and safety goggles!!!
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Questions
What can be observed when the two liquids are mixed?
Which reaction takes place?
Procedure
- Prepare 50 mL of a saturated solution of calcium hydroxide.
- Put a small amount of carbonated mineral water in one tube, and in another tube, we put a small amount of the saturated solution of calcium hydroxide.
- Pour the contents of one tube into the other and observe what happens.
Theoretical explanation
Calcium hydroxide carries the ions Ca2+ and OH–. In this case, both ions participate in the reaction. The carbonated mineral water carries dissolved CO2. The reaction that takes place is as follows:
CO2 + Ca2+ + 2 OH– CaCO3 + H2O
Calcium carbonate is not soluble in water and it forms a precipitate.
