ChemLab (Density)

ChemLab (Density) - Densities of Solids and Liquids Results...

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Densities of Solids and Liquids September 11, 2007
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Results and Discussion: The identity of an unknown solid and an unknown liquid were determined by calculating the density of each. Various methods were used to measure the mass and volume of the unknowns to the highest degree of precision and accuracy, and in each case, three trials were performed and tabulated. Table 1: Mass of Unknown Solid 9 Trial # Mass (g) 1 18.178 2 18.179 3 18.179 The average of the three trials measuring the mass on an electronic scale,
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Avg. = (18.178g + 18.179g + 18.179g) = 18.179g 3 was considered to be the mass of unknown solid 9. The small average deviation, calculated to be Avg. deviation = |18.179g – 18.178g| + |18.179g – 18.179g| + |18.179g – 18.179g| = 0.000333g 3 and the small relative average deviation, calculated to be Relative avg. deviation = 0.000333g = 0.00183% 18.179g indicate a high level of precision in the experiment results. Table 2: Volume of Water Displaced by Unknown Solid 9 Trial # Displacement (mL) 1 11.9 – 10.0 = 1.9 2 12.0 – 10.0 = 2.0 3 12.0 – 10.1 = 1.9 The average of the three trials measuring displacement of 10.0 mL of water,
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Avg. = 1.93 mL displaced was considered to be the volume of unknown solid 9.
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