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chem 100-02_report_lab 3

chem 100-02_report_lab 3 - Katie Stonesifer Chem 110-102...

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Katie Stonesifer Chem 110-102 September 23, 2009 Team: John Cannon General Chemistry 1 Fall Semester 2009 Expt. # 3: Density Determined by Accuracy and Precision
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Stonesifer 1 Introduction: in this experiment we were trying to find accuracy and precision with volumetric glassware and use that data to determine which method gave us the least percent error. We read sealed buret barrels, used a buret to determine the density of water, used a volumetric pipet to determine the density of water, and then used a volumetric flask to determine the density of water, and then used one of the above methods, with the least percent error, to identify an unknown Pepsi sample. After using each method we calculated our error and then percent error with the data collected from each experiment. Data and Observations: For part A: Reading Sealed Buret Barrels Buret pair letter I J Water level in buret 1 47.6 38 Water level in buret 2 13 3.1 Difference in water levels 34.6 34.9 Known difference in water levels 34.6 33.47 Error in difference in water levels 0 1.43 % error 0 4.27% For Part B: Using a Buret to Determine the Density of Water Increment # Buret reading (ml) Mass of beaker 0 1.5 50.505 1 10 59.019 2 19 67.989 3 28 76.907 4 37 85.872 5 46 94.865
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For part C: Using a Volumetric Pipet to Determine the Density of Water Trial # Weight of empty beaker
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