describe an experiment to demonstrate that an expired air contains carbon dioxide
You need a straw and some lime water
Pour some lime water into a cup. With the help of the straw, blow air into the cup containing the lime water. You will see that the lime water will turn milky
This shows that there is carbon dioxide in expired air
Describe an experiment to demonstrate that an expired air contain carbon dioxide
How would you demonstrate the expired air contains carbon dioxide
Blow exhaled air into lime water
Blow air
blow breath into lime water. https://www.bbc.com/bitesize/guides/zsry39q/revision/3
Pls I want you to describe an experiment to demonstrate that expired air contains CO2
An experiment to demonstrate that expired air contains CO2
To demonstrate that expired air contains carbon dioxide, you can conduct a simple experiment using a chemical indicator called limewater. Limewater reacts with carbon dioxide to form a white precipitate, which can help you determine the presence of carbon dioxide in expired air. Here's how you can set up the experiment:
Materials needed:
1. Limewater solution (saturated calcium hydroxide solution)
2. Test tube
3. Straw or another way to blow air into the test tube
4. Graduated cylinder or syringe (optional)
Procedure:
1. Start by preparing the limewater solution. You can dissolve calcium hydroxide in water until no more dissolves, creating a saturated solution. Obtain this solution in a test tube, filling it up to about one-third or half of its capacity.
2. Position the test tube in a way that you can easily blow air into it. You can hold it upright and make sure it's steady.
3. Take a deep breath, making sure your lungs are filled with air. Expel the air forcefully into the test tube through a straw or directly from your mouth. Make sure to blow all of your air into the test tube.
4. Observe any changes in the limewater. If carbon dioxide is present in your expired air, the limewater should turn cloudy or form a white precipitate. This reaction occurs due to the formation of calcium carbonate, which is insoluble and appears as a white solid.
Explanation:
When you exhale, the air you breathe out contains a mixture of gases, including carbon dioxide. In the presence of carbon dioxide, the limewater in the test tube reacts chemically, producing a white precipitate. This reaction occurs due to the formation of calcium carbonate, which makes the limewater appear cloudy or milky.
By conducting this experiment, you can visually demonstrate that expired air contains carbon dioxide, which is an important waste product produced by the human respiratory system.