MCAT Physical : Freezing Point
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Example Question #51 : Solution Chemistry
Colligative properties are properties of compounds that are altered by the amount of substance present. There are four main colligative properties: boiling point, freezing point, vapor pressure, and osmotic pressure. The change in each of these properties can be calculated using the amount of molecules/ions present in solution and the concentration or partial pressure of the compound. The boiling point is defined as the temperature at which the vapor pressure equals the atmospheric pressure. The freezing point is the temperature at which a liquid is converted to a solid. Vapor pressure is the pressure produced by the vapor above a solution. Osmotic pressure is the pressure required to prevent flow of water into a solution (across a membrane).
Consider the following two solutions:
Solution A:
Solution B:
Which of the following is true regarding these two solutions?
Solution A has 2 times higher freezing point
Solution B has 2 times higher freezing point
Solution B has 3 times higher freezing point
Solution A has 3 times higher freezing point
Solution A has 3 times higher freezing point
The freezing point depression can be calculated by the following equation.
where 
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