Rubenstein_Exp2

Rubenstein_Exp2 - Experiment 2 Scientific Measurement and Error Fall 2009 Name Alec Rubenstein TA Tom Martz Documentation Lab Day and Time Section

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Experiment 2 – Scientific Measurement and Error Fall 2009 Name Alec Rubenstein Lab Day and Time 09/19/09, 1:00 PM TA Tom Martz Section 403 Documentation Experiment 2 Lab Manual, Pre-Lab Notes Grading Rubric Possible Points Points Received Materials and Methods 10 Reference lab manual Only describe deviations Results and Discussion 70 Insert titles for tables Showed complete sample calculations Summarized all data in tables Answered questions correctly Uses experimental data to clearly expresses differences between accuracy and precision Error analysis Laboratory Technique 20 TOTAL (100) TA Comments/Suggestions:
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C HEMISTRY 101L R EPORT T EMPLATE EXPT. Scientific Measurements and Error 2 Introduction The purpose of this report is to determine the accuracy and precision of common scientific equipment. The purpose of the experiment is to learn how scientific measurements are carried out properly using an electronic balance and various pieces of volumetric glassware, and to acquire an appreciation of the significance of measurements. Materials and Methods The procedure for this experiment was taken from Lab Manual: Experiment 2. A Pasteur pipet, thermometer, pipet bulb, and marker were obtained. The thermometer was placed on the table for five minutes and calibrated to the room’s temperature which was 23° C. The volume of 1.0000 g of water at 23° C is 1.0034 mL. The mass of 1.000 mL of water at 23° C was calculated to equal 0.9966 g. The pipet bulb was placed on the Pasteur pipet. The Pasteur pipet was filled with water to a nonspecific point and the water line was marked with a marker. The mass of the Pasteur pipet was measured using an analytical balance. The mass of the Pasteur pipet was 5.451 g. Water was expelled from the Pasteur pipet and the Pasteur pipet was reweighed until the difference in mass was equal to 0.9966 g. The new water line was marked with the marker, indicating a measurement of 1 mL of water from the initial mark. Results and Discussion The goal of the first part of the experiment is to determine the precision of the electronic balances in the lab. The data used for analysis are summarized in Table 1. Table 1. Precision of Electronic Balances Sample Mass (g) Trial 1 Mass (g) Trial 2 Mass (g) Trial 3 Mass (g) Trial 4 Weighing bottle with lid 73.584 g 73.585 g 73.585 g 73.585 g Weighing bottle without lid 50.553 g 50.554 g 50.553 g 50.554 g Weighing bottle lid only 23.031 g 23.031 g 23.031 g 23.031 g Weighing bottle with lid on different balance 73.585 g 73.586 g 73.585 g 73.586 g
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Rubenstein_Exp2 - Experiment 2 Scientific Measurement and Error Fall 2009 Name Alec Rubenstein TA Tom Martz Documentation Lab Day and Time Section

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