4 - 2 Advanced Chemistry with Vernier LabQuest 4 PROCEDURE 1. Obtain and wear goggles. 2. Connect the Temperature Probe to LabQuest and choose New from the File menu. If you have an older sensor that does not auto-ID, manually set up the sensor. 3. On the Meter screen, tap Rate. Change the data-collection rate to 1 sample/second and the data-collection duration to 600 seconds. Part I Determine the Freezing Temperature of Pure Lauric Acid 4. Add about 300 mL of tap water with a temperature of 20–25°C to a 400 mL beaker. Place the beaker on the base of the ring stand. 5. Use a utility clamp to obtain a test tube containing hot, melted lauric acid from your instructor. Fasten the utility clamp at the top of the test tube. CAUTION: Be careful not to spill the hot lauric acid on yourself and do not touch the bottom of the test tube. 6. Insert the Temperature Probe into the hot lauric acid. Fasten the utility clamp to the ring stand so the test tube is above the water bath. 7.Start data collection. Lower the test tube into the water bath. Make sure the water level outside the test tube is higher than the lauric acid level inside the test tube, as shown in Figure 1.8.With a very slight up-and-down motion of the Temperature Probe, continuouslystir the lauricacid for the ten-minute duration of the experiment.9.
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