Question 20Steam Plants - Assistant Engineer

70% to pass

Which of the following chemicals is used in an Orsat apparatus to absorb carbon dioxide?

APotassium hydroxide
BCuprous chloride
CPyrogallic acid
DPotassium chromate
AI Explanation

The correct answer is A) Potassium hydroxide. Potassium hydroxide (KOH) is used in an Orsat apparatus to absorb carbon dioxide (CO2) from the gas sample being analyzed. The Orsat apparatus is a device commonly used to determine the composition of flue gases, including the concentration of CO2. Potassium hydroxide has a high affinity for CO2 and will selectively remove it from the gas mixture, allowing the remaining components to be measured. The other options are incorrect because: B) Cuprous chloride is used to absorb oxygen, not CO2; C) Pyrogallic acid is used to absorb oxygen, not CO2; and D) Potassium chromate is not typically used in an Orsat apparatus for gas analysis.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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