A student conducted an experiment to show CO2 is released during respiration. List two precautions that he/she must take for obtaining correct observations.

When conducting an experiment to demonstrate the release of carbon dioxide (CO2) during respiration, there are several precautions that a student should take to ensure accurate and reliable observations. Here are two important precautions:

Ensure Proper Sealing of the Container:

Precaution: The container used to collect the exhaled air must be tightly sealed.
Reason: Any leakage in the container can lead to the escape of carbon dioxide and compromise the accuracy of the results. To ensure that the observed gas is indeed the exhaled carbon dioxide from respiration, the container must be airtight to prevent the entry of atmospheric air.

Use an Appropriate Absorbent:

Precaution: Choose a suitable absorbent to capture the carbon dioxide.
Reason: To accurately measure the amount of carbon dioxide released during respiration, it’s important to use an appropriate absorbent that selectively captures CO2 without interfering with other gases present in the exhaled air. Commonly used absorbents include soda lime or potassium hydroxide (KOH). Choosing the right absorbent minimizes the risk of absorbing other gases and ensures that the observed changes are primarily due to the release of carbon dioxide.
These precautions help maintain the integrity of the experimental setup and ensure that the observed changes are attributable to the release of carbon dioxide during respiration, providing reliable and accurate results.
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