Chem Ed 4.doc

Figure 2 a set of simple commercially produced bubble

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Figure 2. A set of simple commercially produced bubble viscometers. Note: As viscosity is dependent on temperature, when taking the measurements the tube must be held in a clamp, as warm hand will affect the temperature of the fluid. 1
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SAFETY PRECAUTIONS – IN CASE ONE OF THE SEALED TUBES BREAKS 1. A laboratory coat and PVC or nitrile gloves, safety glasses and fully enclosed shoes must be worn. 2. Hair must be tied back. 3. No food or drink can be eaten in the laboratory. 4. There should be no flames in the laboratory. AIM To determine the relationship between the temperature and viscosity of one of more different samples of biodiesel. MATERIALS REQUIRED one or more sealed bubble viscometers containing different samples of biodiesel thermometer (-10 C – 110 C) clamp for holding bubble viscometers vertical stand large beaker containing ice and water water baths at two different temperatures stop watch PROCEDURE Room temperature Step 1. Secure one tube in the clamp in a stand, and hold vertically until the air bubble travels to the top. Step 2. Measure and record the air temperature. Step 3. Quickly invert the tube, ensuring that it is vertical, and start the stopwatch. Step 4. Measure and record the time taken for the air bubble to travel from the bottom to the top of the tube, or to the mark on the tube. Step 5. Repeat Steps 1 to 3 at least twice, to determine an average time. Step 6. If you have more than one different sample of biodiesel, repeat Steps 1 -5 for each sample. Ice water Step 7. Secure one tube in the clamp and sit it vertically in the ice water for 5 minutes so the fluid comes to the same temperature as the water. By this time the air bubble should be at the top of the tube. Step 8. Measure and record the temperature of the water. Step 9. Repeat Steps 3 to 6. Other water baths Step 10. Repeat Steps 7 to 9 for the other water baths. 2
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CALCULATIONS 1. For each sample, calculate the mean time taken for the bubble to rise to the top of the tube at each temperature.
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