Question

You are given a test tube with two outlets and a bottle of lime water. Using same, how would you demonstrate experimentally the presence of carbon dioxide in air.

Answer 1

Procedure:

1. Take lime water in a test tube with two outlets ‘A’ and ‘B’ as shown above.
2. Air is sucked slowly through the outlet ‘B’.
3. Air moves in through end ‘A’ and passes through the lime water

Observation:

The line water in the test tube turns milky.

Conclusion:

Air which is sucked in from and ‘A’ contains carbon dioxide which turns the lime water milky. Hence, air contains – carbon dioxide.