Answer:
The soda needs to be changed when there is a color change.
Explanation:
In order to detect the rate of use or exhaustion of soda, the determination of the inspired carbon dioxide, CO₂ is a reliable method. The measurement is done by means of a capnograph. This is the plot of the amount of CO₂ against time. When the CO₂ reacts with the soda lime, heat and water are formed. This is also accompanied by a pH change. The pH change causes the indicator to change color from white to pink. This change in color indicates that the soda lime is nearing exhaustion. The soda lime is changes when about two-thirds of the canister changes color.
Soda-lime is a mixture of [tex]\rm CaO[/tex] and [tex]\rm NaOH[/tex] that is used in anesthesia, rebreathers and submarines to dismiss carbon dioxide from the oxygen and prevent poisoning.
Monitoring of soda lime is accomplished to comprehend the time to switch the canister and to document the time used.
The method to detect the usage of soda is by determining the inspired amount of carbon dioxide. It is calculated using a capnograph in which the carbon dioxide is plotted against the time.
When the canister is attached to the patient it gets depleted after 6 - 8 hours of use and slightly turns purple due to a change in pH because of water and heat formation.
The colour change indicates that the soda lime is exhausting and needs to be changed.
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