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(a) Using the data from the table, determine the molality of the deicer solution. molality = m KCI %3D (b) Based on the collected data, what is the van't Hoff factor? The K, for water is 1.86 °C/m.

(a) Using the data from the table, determine the molality of the deicer solution. molality = m KCI %3D (b) Based on the collected data, what is the van't Hoff factor? The K, for water is 1.86 °C/m.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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### Experiment Instructions and Data Results on Deicer Solution Freezing Point Depression #### Laboratory Procedure 1. **Measured the volume of water and transferred it to the calorimeter.** 2. **Added the deicer to the calorimeter and dissolved it in the water.** 3. **Measured the mass of the calorimeter with its contents.** 4. **Added ice to the calorimeter and reweighed it.** 5. **Placed a lid on the calorimeter, monitored the temperature of the solution, and recorded the freezing temperature.** 6. **Decanted the deicer solution, keeping the stir bar and remaining ice. Then measured the mass of the calorimeter with its remaining contents.** #### Experimental Data Table | Parameter | Trial 1 | |-----------|---------| | Freezing temperature of deionized water | 0.02°C | | Deicer used (chemical formula) | KCl | | Mass of calorimeter + stir bar | 12.74 g | | Mass of deicer | 2.85 g | | Volume of water | 58.6 mL | | Mass of calorimeter, stir bar, deicer, water, and added ice | 126.97 g | | Mass of calorimeter, stir bar, and remaining ice | 65.10 g | | Minimum temperature reached | -2.34°C | #### Tasks (a) **Using the data from the table, determine the molality of the deicer solution.** \( \text{molality} = \, \, \, \text{m KCl} \) (b) **Based on the collected data, what is the van't Hoff factor? The \( K_f \) for water is 1.86 °C/m.** \( i = \, \, \, \text{calculated value} \) #### Explanation of Table Data - **Freezing temperature of deionized water (0.02°C):** This is the baseline measurement of the freezing temperature of pure deionized water. - **Deicer used (KCl):** Potassium chloride is used as the deicer in this experiment. - **Mass of calorimeter + stir bar (12.74 g):** The initial mass of the empty calorimeter together with the stir bar. - **Mass of deicer (2.85 g):** The mass of potassium chloride used in the deicing
Transcribed Image Text:### Experiment Instructions and Data Results on Deicer Solution Freezing Point Depression #### Laboratory Procedure 1. **Measured the volume of water and transferred it to the calorimeter.** 2. **Added the deicer to the calorimeter and dissolved it in the water.** 3. **Measured the mass of the calorimeter with its contents.** 4. **Added ice to the calorimeter and reweighed it.** 5. **Placed a lid on the calorimeter, monitored the temperature of the solution, and recorded the freezing temperature.** 6. **Decanted the deicer solution, keeping the stir bar and remaining ice. Then measured the mass of the calorimeter with its remaining contents.** #### Experimental Data Table | Parameter | Trial 1 | |-----------|---------| | Freezing temperature of deionized water | 0.02°C | | Deicer used (chemical formula) | KCl | | Mass of calorimeter + stir bar | 12.74 g | | Mass of deicer | 2.85 g | | Volume of water | 58.6 mL | | Mass of calorimeter, stir bar, deicer, water, and added ice | 126.97 g | | Mass of calorimeter, stir bar, and remaining ice | 65.10 g | | Minimum temperature reached | -2.34°C | #### Tasks (a) **Using the data from the table, determine the molality of the deicer solution.** \( \text{molality} = \, \, \, \text{m KCl} \) (b) **Based on the collected data, what is the van't Hoff factor? The \( K_f \) for water is 1.86 °C/m.** \( i = \, \, \, \text{calculated value} \) #### Explanation of Table Data - **Freezing temperature of deionized water (0.02°C):** This is the baseline measurement of the freezing temperature of pure deionized water. - **Deicer used (KCl):** Potassium chloride is used as the deicer in this experiment. - **Mass of calorimeter + stir bar (12.74 g):** The initial mass of the empty calorimeter together with the stir bar. - **Mass of deicer (2.85 g):** The mass of potassium chloride used in the deicing
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