Amount of water that constitutes soda lime in carbon dioxide absorber is
**Core Concept**
The underlying principle being tested is the composition of soda lime, a carbon dioxide absorber used in medical settings, particularly in anesthesia machines. Soda lime is a mixture of calcium hydroxide, sodium hydroxide, and silica, designed to react with carbon dioxide. The amount of water in soda lime is crucial for its effectiveness.
**Why the Correct Answer is Right**
The correct answer is related to the optimal amount of water required for the chemical reaction that absorbs carbon dioxide. Soda lime typically contains about 14% water, which facilitates the reaction between calcium hydroxide and carbon dioxide to form calcium carbonate. This reaction is essential for removing carbon dioxide from breathing gases.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not represent the standard water content in soda lime.
**Option B:** Similarly, this option does not accurately reflect the typical water composition of soda lime.
**Option D:** This option is also incorrect as it deviates from the known water content required for effective carbon dioxide absorption.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that the water content in soda lime affects its ability to absorb carbon dioxide. A decrease in water content can lead to decreased efficiency of the absorber, potentially resulting in increased carbon dioxide levels in the breathing circuit.
**Correct Answer:** C. 14%