Testing for Carbon Dioxide Gas

Aim:
To show that Carbon Dioxide gas is produced when a metal carbonate reacts with acids. 

Method:

1.  Add a pea-sized amount of the metal carbonate into one of the boiling tubes.
2.  Place this boiling tube into a test tube rack. Ensure you have the bung and delivery tube ready. 
3.  Add 5ml of acid to the boiling tube and quickly insert the bung and delivery tube into the mouth of the boiling tube.
4. Holding the other boiling tube with your tongs, capture the gas produced. 
5. When you think that the tube is full, light a wooden splint. 
6. Carefully remove the boiling tube from under the delivery tube, taking care to keep it facing upward. 
7. Insert the burning splint into the mouth of the test tube. 

Results/Observations TEST 1. 
Once the enflamed splint went into the flame. The orange flame went out immediately. 

Result/ Observations TEST 2. 
During the second version of the experiment, the limewater went cloudy. 

Discussion 
During this experiment, we observed a chemical reaction. This reaction was between the Metal Carbonate (Calcium Carbonate) and the acid (Hydrochloric acid). During test 1, the flame chocked and went out due to having no Oxygen within the space. When doing the experiment many gas bubbles were formed in the test tube, and when we put the lit splint in, the flame went out. 

 Regarding test 2 with the Limewater, the result was the Limewater going cloudy. The Limewater goes cloudy because it reacts with Carbon Dioxide to form Calcium carbonate which is insoluble in water resulting in making the Limewater cloudy. 





Conclusion
During these experiments, we watched a chemical reaction occur. Metal Carbonate (Calcium Carbonate) reacted with Hydrochloric acid. 

Calcium Carbonate + Hydrochloric acid ----> Calcium Chloride + Carbon Dioxide + water.
As the gas went through the delivery tube, the receiving tube filled with gas and if it went longer it would have left a carbon dioxide and calcium chloride in the first boiling tube.