Figure 1MATERIALSLabQuest18 x150 mL test tubeLabQuest Applauric acidTemperature Probebenzoic acidring standthermometerutility clampwater400 mL beakerPROCEDURE1.Obtain and wear goggles.
2.Connect the Temperature Probe to LabQuest.3.You will manually collect temperature data for up to 10 minutesNote to instructor before lab set of a water bath that is between 70-90°C and make sure the student don’t burn themselves on the hot test tubs. The benzoic acid take 5-10 minutes and lots of stirring to dissolve at 80°C. Part I Freezing Temperature of Pure Lauric Acid4.Set up a ring stand with a clamp that will hold your test tub. Completely circle the top of the testtub with tape and label it with your initials, then recored the weight of the test tub in your lab note book. 5.Weight out 10.0g of solid lauric acid and pure into your test tub.6. Bring your test tub to the instructor’s hot water bath. After 10 minutes or once the lauric acid is melted carefully remove it from the hot water (60-80°C) without touching the hot bottom of the glass test tub and clamp it to the ring stand on your work area. Solid lauric acid, CH3(CH2)10COOH: Causes eye irritation and mild skin irritation; do not to spill the hot lauric acid on yourself. Do not touch the bottom of the test tube. 7.Insert the Temperature Probe into the hot lauric acid. After the 30 seconds have elapsed or the temperature has stopped rising, start data collection. Record the temperature every 15 seconds for 10 minutes. If the lauric acid is not above 50°C after the 30 second, reheat the lauric acid inthe hot water bath and begin again.9.With a very slight up and down motion of the Temperature Probe, continuouslystir the lauric acid during the cooling. Hold the top of the probe and notits wire. DO NOT clink the probe agents the sides or bottom of the test tub just gently swirl or move up and down.