Question

Describe simple experiments to show the presence of -

carbon dioxide in air using a test tube with outlets containing lime water.

Answer 1

Carbon dioxide in air:

Apparatus- A test tube containing lime water with two outlets ‘A’ and ‘B’.

Procedure -Air is sucked slowly from the outlet ‘B’ as shown above.

Observation - The lime water in the test tube turns milky.

Conclusion - Air which is sucked in from end ‘A’, passes through the lime water and contains carbon dioxide which turns lime water milky [This is a test for carbon dioxide gas].