When is freezing point depression used

Again, since we are dealing with mixtures with decreased chemical potential, we expect the freezing point to change. Unlike the boiling point, the chemical potential of the impure solvent requires a colder temperature for it to reach the chemical potential of the pure solid solvent. Therefore, a freezing point depression is observed. What is the molar mass of the compound? First we must compute the molality of the benzene solution, which will allow us to find the number of moles of solute dissolved.

The freezing point depression is especially vital to aquatic life. Since saltwater will freeze at colder temperatures, organisms can survive in these bodies of water. Road salting takes advantage of this effect to lower the freezing point of the ice it is placed on. Lowering the freezing point allows the street ice to melt at lower temperatures. Benzophenone has a freezing point of Find the freezing point depression constant for the solvent.

Introduction Nonelectrolytes are substances with no ions, only molecules. Solution First we must compute the molality of the benzene solution, which will allow us to find the number of moles of solute dissolved.

Applications Road salting takes advantage of this effect to lower the freezing point of the ice it is placed on. Problems Benzophenone has a freezing point of References Atkins, Peter and de Paula, Julio. Physical Chemistry for the Life Sciences. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads.

Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Share Flipboard Email. Anne Marie Helmenstine, Ph. Chemistry Expert. Helmenstine holds a Ph. She has taught science courses at the high school, college, and graduate levels. Facebook Facebook Twitter Twitter. Featured Video. Cite this Article Format.

Helmenstine, Anne Marie, Ph. Learning Objective Discuss the effects of a solute on the freezing point of a solvent. Key Points The freezing point depression can be calculated using the pure solvent freezing point and the molality of the solution. At the freezing point, the vapor pressure of both the solid and liquid form of a compound must be equal. The freezing point of a substance is the temperature at which the solid and liquid forms are in equilibrium. To reattain equilibrium, the freezing point of the solute and solvent mixture is lowered relative to the original pure solvent.

Show Sources Boundless vets and curates high-quality, openly licensed content from around the Internet. Licenses and Attributions. CC licensed content, Shared previously.