Viscosity of Liquids Lap Report

1815 Words Apr 6th, 2011 8 Pages
Experiment 1: Viscosity of Liquids
Victoria Kulczak
Lab Partners: Laina Maines & Heidi Osterman
Date of Lab: 2/21/11
Due Date: 2/28/11

Abstract: The goal of this experiment was to determine the viscosity of given liquids. Two different methods were employed, the first measures time of flow of several methanol-water solutions, from point A to point B. The second method involves dropping a foreign object, in this case a sphere, into a cylinder of glycerol and measuring the time it takes for it to travel a specific distance down the tube. The viscosity of a 0%, 20%, 40%, 60%, 80% and 100% methanol by volume solutions was measured to be 0.89, 1.28, 1.53, 1.46, 1.11 and 0.54±0.001P, respectively. The falling sphere method was performed under
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Suction from the aspirator was used to remove any remaining acetone. A pipette was used to add 5mL of water to the wide side of the viscometer, which was then clamped inside a 25°C water bath and allowed to equilibrate for 5-10 minutes, keeping both fiducial marks below the water bath level. A pipette bulb was used to pull the water up the capillary tube until it reached the second reservoir. A stop watch was started when the water meniscus reached the top mark, and stopped when it reached the bottom mark. The same calibration was repeated twice more to obtain an error for time. Next, solutions of methanol-water were made that were 20%, 40%, 60%, 80% and 100% methanol by volume. The methanol was obtained from Pharmaco-AAPER. The same rate of flow procedure performed on the water was performed on the methanol solutions. For part two of this experiment, the viscosity of glycerol was measured. A 250mL graduated cylinder was filled with glycerol, obtained from Fischer Scientific, until the level of glycerol was 3cm up the tubing in the stopper that was in place on top of the cylinder. The temperature as well as the height of the glycerol was measured. The mass of 3/32 inch stainless steel and Teflon spheres was measured by weighing out approximately 10 spheres and dividing by the number of

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