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, a bottle of acid, small amount of metal carbonate, test tube tongs, safety glasses. 

Method: 1. Light your Bunsen burner.

2. Add a 'pea-sized' amount of the metal carbonate into one of the rubes.

3. Place this boiling tube into a test tube rack. Ensure you have the bung and delivery tube ready. 

4. Add 5mL 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 lungs, 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. 

Result

Test 1 showed that the splint going out in an instance when I added to the test tube. It went out due to no oxygen within the space.

Lime water result

Test 2 with lime water showed that the liquid became cloudier and foggier.

Discussions

While doing the experiment we watched a chemical reaction occur.  

Calcium carbonate + Hydrochloric acid ---> Calcium  chloride + carbon dioide + water