Chem lab #1 - Density of Liquids and Solids By Yiliu(Peter...

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Density of Liquids and Solids By Yiliu (Peter) Wang Teaching Assistant: Josie Bodle September 7, 2007
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Results and Discussion: Controlled Experiment: Distilled water was used first as a control to check the accuracy and precision of the balance. Water was used since the density of water was known to be 1.00 g / mL. It is then possible to check the balance by seeing whether experimental mass over volume correlated with actual density, which is 1.00 g / mL. A graduated cylinder was weighted several times on the balance. Its mass was always 69.586 grams. This entails that the balance is precise. 25.0 mL of distilled water was then poured into the graduated cylinder, and the weight of the water and the graduated cylinder was measured to be 94.552 grams. Subtracting the two numbers gives the change in mass, which was measured out to be 24.966 grams. Dividing that by the change in volume, or 25.0 mL, gives distilled water’s experimental density of .998 g/mL. Percent error: |( .998 – 1.00 / 1.00 )| X 100 % = .002 % The balance was determined, due to the minimal error of .002%, to be accurate. Liquid Density Experiment: #4 Liquid Unknown was acquired. It was observed as clear, not viscous, and having an alcohol-like odor. In order to determine the density of the liquid unknown, the mass of the graduated cylinder was measured. Then after pouring in 10.0 mL of liquid unknown by use of the 10 mL pipette, the final mass was measured.
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