* Carbon dioxide gas (CO₂): This is the gas that causes the fizzing.
* Sodium sulfate (Na₂SO₄): This is a soluble salt that remains dissolved in the solution.
* Water (H₂O): This is also produced as a result of the reaction.
Here's the balanced chemical equation for the reaction:
2 NaHCO₃ (aq) + H₂SO₄ (aq) → Na₂SO₄ (aq) + 2 CO₂ (g) + 2 H₂O (l)
Explanation:
The hydrogen ions (H⁺) from the sulfuric acid react with the hydrogen carbonate ions (HCO₃⁻) from the sodium hydrogen carbonate. This reaction releases carbon dioxide gas, which is why you see the fizzing. The remaining ions then combine to form sodium sulfate and water.
Observations:
* Fizzing: The most obvious observation is the production of carbon dioxide gas, which causes the solution to fizz.
* Temperature change: The reaction is slightly exothermic, meaning it releases a small amount of heat. You might notice a slight warming of the solution.
* Change in pH: The pH of the solution will decrease, becoming more acidic, as the sulfuric acid is consumed.
This reaction is commonly used in baking to make cakes and bread rise. The sodium hydrogen carbonate (baking soda) releases carbon dioxide gas when it reacts with an acid in the batter, creating air pockets that give the baked goods their texture.
