AAAE ACE Operations Module 4 Practice Exam

What is the limit of freezing point depression?

Boiling point Eutectic temperature Melting point Triple point

Correct Answer:

Eutectic temperature

Explanation:

Freezing point depression lowers the freezing temperature as you add solute, but this decrease stops at a specific, lowest temperature for a given mixture—the eutectic temperature. At the eutectic composition, the liquid solidifies into a mixture of two solid phases at a single temperature, so you can’t depress the freezing point any further for that system. The other terms describe different phase transitions: boiling point is where a liquid becomes vapor, melting point is where a pure solid becomes liquid, and the triple point is where solid, liquid, and gas coexist.

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