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4. Freezing-point depression The freezing-point depression of the solution is the difference between the freezing-point of the solvent (water) and the freezing-point of the solution. ?Tf = 0.02 °C - (-2.56 °C) = 2.58 °C 5. van't Hoff factor For an ideal solution, the van't Hoff factor is a positive whole number. To experimentally determine the van't Hoff factor, graph the freezing-point depression versus the molality of each solution and add a linear regression line. The slope of the regression line will equal the product of the van't Hoff factor (i) and the molal freezing-point depression constant. Rearrange the relationship to calculate the van't Hoff factor. slope = i · Kf i = slope / Kf

          4. Freezing-point depression
The freezing-point depression of the solution is the difference between the freezing-point of the solvent (water) and the freezing-point of the solution.

?Tf = 0.02 °C - (-2.56 °C) = 2.58 °C

5. van't Hoff factor
For an ideal solution, the van't Hoff factor is a positive whole number. To experimentally determine the van't Hoff factor, graph the freezing-point depression versus the molality of each solution and add a linear regression line.

The slope of the regression line will equal the product of the van't Hoff factor (i) and the molal freezing-point depression constant. Rearrange the relationship to calculate the van't Hoff factor.

slope = i · Kf

i = slope / Kf

4. Freezing-point depression
The freezing-point depression of the solution is the difference between the freezing-point of the solvent (water) and the freezing-point of the solution.

?Tf = 0.02 °C - (-2.56 °C) = 2.58 °C

5. van't Hoff factor
For an ideal solution, the van't Hoff factor is a positive whole number. To experimentally determine the van't Hoff factor, graph the freezing-point depression versus the molality of each solution and add a linear regression line.

The slope of the regression line will equal the product of the van't Hoff factor (i) and the molal freezing-point depression constant. Rearrange the relationship to calculate the van't Hoff factor.

slope = i · Kf

i = slope / Kf

Added by Christy M.

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