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QuizMultiple Choice

Freshwater vs Saltwater Properties — Quiz

Question 1 • Earth and Space Science

Which trend best describes the relationship between salinity and boiling point?

Answer
A
As salinity increases, boiling point remains constant at 100\ °\text{C} because boiling point is a state property.
B
As salinity increases, boiling point decreases because water evaporates more easily at high temperatures.
C
As salinity increases, there is no measurable effect on boiling point because water can evaporate at different temperatures.
D
As salinity increases, boiling point increases because dissolved salts require more energy to separate water molecules.

Explanation

Dissolved salt lowers water’s vapor pressure, so the solution must be heated to a higher temperature before its vapor pressure matches the surrounding pressure and it boils. Therefore, increasing salinity raises the boiling point. The correct choice is “As salinity increases, boiling point increases because dissolved salts require more energy to separate water molecules.”

AI-written and checked against the verified answer.

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