Question

Prepare an activity to evaluate the presence of Co2 in exhaled gases. for class 10 ​

Answer 1

Limewater Test - To check for carbon dioxide in your breath

Lime Water Breath Experiment

Using lime water is a fun and easy way to test for the presence of carbon dioxide. The exhaled carbon dioxide is used to produce a precipitate of calcium carbonate with the lime water.

carbon dioxide + calcium hydroxide (limewater) → calcium carbonate + water

Procedure:

1. Add 50 ml of lime water to two 100 ml beakers.

2. Bubble room air through one beaker for one minute using a pipette and pipette pump. Observe and record the results.

3. With the other beaker, bubble exhaled air through the solution for 1 minute. Try to bubble the air through the same rate that you did with the first beaker. After 1 minute record your results.