Cambridge Secondary (7-9). Stage 7. Science. Learner's Book - Unit 8: Changes to materials - Question 61

Try these reactions and test the gas that is given off.

You will need:
The apparatus shown in the diagrams

Safety
Wear safety glasses.

Testing for carbon dioxide
1. Pour limewater into a test tube until it is about half full.
2. Place a small amount of calcium carbonate into another test tube.
3. Add some hydrochloric acid to the calcium carbonate in the test tube.
4. Quickly fit the rubber bung and delivery tube.
5. Ensure the delivery tube reaches into the limewater.

Describe the changes to the limewater when you tested for carbon dioxide.