Certified Maintenance & Reliability Professional (CMRP) Practice Exam

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What is the primary use of Karl Fischer's coulometric titration method?

Determining the metallic content in oil samples
Determining water content in oil samples
Measuring pH levels in liquid samples
Analyzing gas mixtures for safety

The correct answer is: Determining water content in oil samples

The primary use of Karl Fischer's coulometric titration method is to determine the water content in various samples, including oil. This quantitative analytical technique specifically measures how much water is present in a sample by utilizing the chemical reaction of water with iodine in the presence of a solvent, typically anhydrous methanol. In the context of oil samples, knowing the water content is crucial because excess water can lead to corrosion, spoilage, and other degradation processes that affect the quality and reliability of the oil. The precision of the coulometric method makes it highly suitable for this purpose, allowing for accurate and reproducible results. Other methodologies mentioned, such as determining metallic content in oils, measuring pH levels, or analyzing gas mixtures for safety, do not align with the foundational principles of Karl Fischer’s method, which is specifically designed for water quantification, thus solidifying option B as the accurate answer.