Lab 12 - Measuring Enthalpy Changes

Lab 12 Measuring Enthalpy Changes

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Unformatted text preview: (aq) 1 mL 1 M FeCl3(aq) 8 mL 0.1 M NaOH(aq) 3 mL 0.1 M HCl(aq) 3 mL 0.1 M HNO3(aq) 3 mL 0.1 M HC2H3O2(aq) 4 drops phenolphthalein indicator 60 g ice www.webassig encheml1/lab_12/manual.html 3/7 4/15/13 Lab 12 - M easur ing Enthalpy Chang es 13 mL deionized water Safety The solutions used in this experiment are diluted, but corrosive. They can attack the skin and cause permanent damage to the eyes. If any of the solutions splash into your eyes, flush them in the eyewash. Hold your eyes open or have someone assist you. If you spill any of the solutions on your skin or clothing, flush the area immediately with water. Have your lab partner notify your instructor about the accident. You will be working with a hot plate. Keep flammable materials (papers, hair, clothing) away from it. It will stay hot for a long time after you have turned it off. Do not touch it until you have felt the air near it and are sure it will not burn you. Waste Disposal The waste from the experiments should be rinsed or scraped into the proper waste container provided by your instructor. Use water in a squeeze bottle to rinse the solid material out of the test tube and then wash the tube with soap and water. Prior to Class Please read the following section of Lab Safety and Practices: Preparing Graphs. Lab Procedure Please print the worksheet for this lab. You will need this sheet to record your data. Part A: Heat of Solution - CaCl2 and NH4NO3 1 Use a spoon- type spatula to dispense anhydrous solid CaCl2 into a dry 30 mL beaker. One spoonful, not he aping, is plenty. 2 Obtain 10 mL of deionized water in a graduated cylinder. 3 Measure the initial temperature of the water and record it in Table A. 4 Pour the water into the beaker containing the CaCl2. 5 Place the thermometer in the beaker. Watch the temperature change on the thermometer. Record the maximum or minimum temperature reached in Table A. 6 When finished, dispose of your solution as directed by your instructor, rinse the beaker...
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This document was uploaded on 01/22/2014.

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