Regents Chemistry Exam June 2024 Question 19
19 Compared to a 2.0 M aqueous solution of KI at 1.0 atm, water at 1.0 atm has a
(1) lower boiling point and a lower freezing point
(2) lower boiling point and a higher freezing point
(3) higher boiling point and a lower freezing point
(4) higher boiling point and a higher freezing point
Solution:
This question is about colligative properties. Colligative properties include boiling point elevation and freezing point depression. When solute is dissolved in pure solvent (such as dissolving KI in water), the boiling point of solution increases and the freezing point decreases. Therefore, the boiling point of pure water should be lower and its freezing point should be higher than that of solution. Choice 2 is the correct answer.
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