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At standard pressure, how do the freezing pointand the boiling point of H2O( ) compare to the freezing point and the boiling point of1.0 M KCl(aq)?

Regents Chemistry Exam August 2024 Question 15


15 At standard pressure, how do the freezing point and the boiling point of H2O(l) compare to the freezing point and the boiling point of 1.0 M KCl(aq)?

(1) Both the freezing point and boiling point of H2O(l) are lower.

(2) Both the freezing point and boiling point of H2O(l) are higher.

(3) The freezing point of H2O(l) is lower, and the boiling point of H2O(l) is higher.

(4) The freezing point of H2O(l) is higher, and the boiling point of H2O(l) is lower.


Solution:

When a solute, such as KCl, dissolves in a solvent such as water, it lowers the freezing point and raises the boiling point of the solution compared to pure water. Therefore, the freezing point of pure water will be higher and the boiling point will be lower than that of KCl aqeous solution. Choice 4 is the correct answer


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