Reaction:
2 NaHCO₃ (s) → Na₂CO₃ (s) + H₂O (g) + CO₂ (g)
Explanation:
* Decomposition: The heat breaks down the sodium hydrogen carbonate molecules.
* Products: The products of the reaction are:
* Sodium carbonate (Na₂CO₃): A white solid.
* Water (H₂O): A colorless liquid that evaporates as steam.
* Carbon dioxide (CO₂): A colorless gas.
Observations:
* Bubbles: You'll observe bubbles forming as the carbon dioxide gas is released.
* Loss of mass: The mass of the sodium hydrogen carbonate will decrease as water and carbon dioxide escape.
* Change in appearance: The white powder will likely change in appearance as it transforms into sodium carbonate.
Applications:
This decomposition reaction is the basis for several applications, including:
* Baking: Baking soda releases carbon dioxide gas, which helps bread and other baked goods rise.
* Fire extinguishers: Some fire extinguishers use baking soda to generate carbon dioxide, which smothers the flames.
Safety Note: While the reaction itself isn't dangerous, it's important to heat sodium hydrogen carbonate in a well-ventilated area. The carbon dioxide gas can displace oxygen, so it's best to avoid enclosed spaces.
