Science metal carbonates and acids

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

Method:
1) light your Bunsen burner 
2) Add a pea-sized amount of the metal  carbonate into on of the boiling tubes.
3) place this boiling into a test tube rack, ensure you have bung and delivery tube ready 
4) Add 5 ml of acid into the boiling to and quickly the bung and delivery tube into the mouth of the boiling tube. 
5) holding the other boiling tube with you tongs, capture the gas.
6) when you think the tube is full your lab partner should light a splint.
7) carefully remove the boiling tube from underneath the delivery tube, taking care to keep if facing upright 
8) insert the burning splint into the mouth of the boiling tube

observation 1 :  The flame got extinguish due to the presents of the carbon dioxide
observation 2 : the solution turned from colorless to cloudy which means that  CO2 was present