Metal carbonates and acid experiment

Aim - to show that carbon dioxide gas is produced when a metal carbonate reacts with acid .

Equipment - two boiling tubes, delivery tube and bing, 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 metal carbonate to one of the test tubes
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 tongs capture the gas produced .
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 - when we put the lit splint in the gas test tube it got extinguished due to the presence of carbon dioxide.