What does purple color change in CO2 absorbent granules usually indicate?

What does purple color change in CO2 absorbent granules usually indicate?

• A. The granules have lost the ability to absorb carbon dioxide.
• B. The granules should be turned over ± they will regain
• C. The granules are more than 90 days old.
• D. The granules have lost the ability to absorb anesthetic gases

Answer: (A)

The main idea is that the color change in the CO2 absorbent indicates its capacity to absorb CO2 has been exhausted. These granules contain a pH indicator that stays purple while the material is fresh and actively absorbing CO2. As the chemical reactions consume the absorbent, the indicator shifts color. When you see a purple color change, it typically signals that the granules have reached exhaustion and can no longer effectively absorb CO2. Replacing the absorbent is needed; simply turning it over won’t restore absorption, and relying on age alone isn’t a reliable cue. The change specifically reflects CO2 absorption capacity, not the presence of anesthetic gases.

The main idea is that the color change in the CO2 absorbent indicates its capacity to absorb CO2 has been exhausted. These granules contain a pH indicator that stays purple while the material is fresh and actively absorbing CO2. As the chemical reactions consume the absorbent, the indicator shifts color. When you see a purple color change, it typically signals that the granules have reached exhaustion and can no longer effectively absorb CO2. Replacing the absorbent is needed; simply turning it over won’t restore absorption, and relying on age alone isn’t a reliable cue. The change specifically reflects CO2 absorption capacity, not the presence of anesthetic gases.