Page 49 - Big Ideas Year 10 sciPAD 2025

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© Silverback Academic Media 49
SCIPAD - BIG IDEAS - BOOK 2
BASIS OF CHEMICAL REACTIONS
Metal Carbonates and Acid
When a metal carbonate reacts with an acid it will form a salt, carbon dioxide and water. Carbon
dioxide is a gas and can be seen as bubbles as the reaction proceeds.
Metal carbonate + acid salt + carbon dioxide + water
Testing for Carbon Dioxide Gas
Aim: To show that carbon dioxide gas is produced when a metal carbonate reacts with
an 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 boiling tubes.
3. Place this 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.
Boiling tube containing carbon dioxide gas
Burning splint inserted into
the mouth of the test tube
Metal carbonate
and acid
Delivery tube
connected to bung
Boiling tube to collect the
gas produced
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