Investigation to determine whether expired air contains carbon dioxide
How should state the method, step by step for the experiment
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write the method to show that expired air contain carbon dioxide
To investigate whether expired air contains carbon dioxide, you can conduct an experiment using a simple chemical reaction to detect the presence of carbon dioxide gas. Here’s a step-by-step procedure for the experiment:
1. Gather the required materials:
- A test tube or glass jar with a lid
- A piece of delivery tubing
- Lime water (calcium hydroxide solution)
- A source of expired air (such as your breath)
2. Prepare the setup:
a. Fill the test tube or glass jar about one-third full with lime water.
b. Cut a piece of delivery tubing about 30 cm long.
c. Insert one end of the delivery tubing into the test tube, ensuring it reaches below the surface of the lime water.
d. Place the lid on the test tube or cover the glass jar to create a sealed environment.
3. Start the experiment:
a. Exhale a deep breath directly into the open end of the delivery tubing.
b. Observe the changes in the lime water.
c. Wait for a few minutes to let the reaction occur.
4. Analyze the results:
a. Look for signs of a chemical reaction, specifically a color change in the lime water.
b. The lime water will turn milky or cloudy if carbon dioxide is present, indicating a positive test result.
c. If the lime water remains clear, it suggests that carbon dioxide is not present in the expired air.
It is important to note that this experiment provides qualitative results, indicating the presence or absence of carbon dioxide. For precise measurements and quantitative analysis, additional laboratory equipment and techniques may be necessary.