Lab 2 procedure - Part I Determining the Freezing Point of...

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Part I. Determining the Freezing Point of Pure Cyclohexane 1. Make an ice-water bath in an 800 mL beaker, adding equal portions of ice and water. Ice may be found in a large bucket near the laboratory door. Obtain a freezing point apparatus found on the main supply shelf. 2. Dispense 10.00 mL of cyclohexane from the dispenser on the cyclohexane bottle in the fumehood, as demonstrated by your TA. Note the listed volume on the dispenser so that the mass of cyclohexane is known for the molality calculation in Part II. Using the known density of cyclohexane (0.7726 g/mL @ 25 o C), calculate the mass of cyclohexane measured. 3. Set up the apparatus as shown in Figure 1. Assemble the inner test tube of the apparatus with the cork, thermometer, and stirrer. Place the assembled inner test tube carefully into the larger test tube. The tape around the outer test tube forms a seal between the two. Mount your 800 mL beaker containing the ice-water bath onto a wire gauze and an iron ring. 4. Measure the temperature of the ice-water bath for later comparison in Part II. Record the temperature to the nearest 0.2 o C. Place the freezing point apparatus in the ice-water bath so that the cyclohexane is well below the surface of the water. Clamp the freezing point apparatus in place. You will need to adjust your thermometer so that you can read the temperature scale between 0 and 10 o C without the tape on the test tube interfering. In addition, the bulb of the thermometer must be well covered by the cyclohexane.
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