Testing for Carbon Dioxide Gas

Aim: To show that carbon dioxide gas is produced when a metal carbonate reacts with acid
Equipment: Two boiling tubes, Delivery tube and bung, Bunsen burner, test tube rack, wooden splint, acid, metal carbonate, test tube tongs, safety glasses


Method: 

1. Light your Bunsen burner
2. Ass a 'pea-sized' amount of metal carbonate into one of the boiling tubes.
3. place the boiling tube into a test tube rack. Ensure you have the bung and delivery tube ready
4. Add 5 mL of acid to the boiling tube and quickly insert the bung and delivery tube into the mouth of the boiling tube.
5. Holding the other boiling tube with your tongs, capture the gas produced as shown in the diagram below.
6. When you think the tube is full, your lab partner should light a wooden splint
7. Carefully remove the boiling tube from under the delivery tube, taking care to keep it facing upright
8. Insert the burning splint into the mouth of the test tube.

Observations:

We observed it becoming extinguished. CO2 was present as well. We did another experiment too. The outcome of this one was that the solution turned from colorless to cloudy. CO2 was present in this experiment as well