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Lab Report #1 Calibrating a Pasteur Pipette

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Jae Shin Steve Pedersen Chem 3AL Lab Report #1 15 September 2010 Experiment 1: Calibrating a Pasteur Pipette Discussion 1. According to the data, the volumes were about the same for each of the three trials using 0.5 and 1.0 mL of water. They were not consistently different. 2. The results suggest that there is no guarantee to deliver the exact amount of volume of solvent; however, from the data, delivering 1 mL of solvent using the Pasteur pipette is more reliable than anything below or more than 1 mL because the Pasteur pipette is designed to deliver about 1 mL of solvent. Questions 1. B. Weigh the solvent on a balance – if the density of the solvent is given, then measuring the solvent using the balance would be the most adequate because the weight of the lap equipments can be measured separately and then weigh the total with the solvent in it and then subtract the differences to calculate the exact amount of volume necessary. 2. C. Estimate the volume using a Pasteur pipette – from this experiment, the
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Unformatted text preview: date showed that the Pasteur pipette delivers approximately 1 mL of solvent. 3. Density = mass/volume; MW = g/mol; D = 1.32g/mL, 0.52mL = 0.001 mol (1.32g/mL) x (0.52mL/0.001mol) x (1/1000) ANSWER: 0.6864 g/mol 4. To ensure that different solvents are not being mixed within the Pasteur pipette – the pipette itself cannot expel every drop of solvent when squeezed with the human hand. 5. 15 drops = 0.16 g ethyl acetate; (1mL/0.90g) x (0.16g/15drops) ANSWER: 0.01185 mL/drop Conclusion From this lab experiment, I have learned to properly use and deliver solvent using a Pasteur pipette and the importance of using new pipette each time with different solvents. I have also learned to measuring liquids by its weight using the weight balance and by volume using graduated cylinder, beakers, and Pasteur pipette. In conclusion, the Pasteur pipette that was used delivers approximately 1 mL of liquid at its maximum draw....
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