Density of a Solid Lab - Stephanie Warner Chem 153 Shidong...

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Stephanie Warner Chem 153 Shidong Chu 16 September 2005 Density of a Solid Purpose: The purpose of this lab is to determine the density of an unknown solid. This lab also introduces the use of analytical balances and typical statistical treatments of experimental data. Calculations: Mass of solid m s = m 2 – m 1 = 40.3439g – 32.1403g = 8.2036g Mass of 25.0 mL of water m 4 – m 1 = 55.4916g – 32.1403g = 23.3153g Mass of water “above” solid m 3 – m 2 = 62.4722g – 40.3439g = 22.1283g Mass of water displaced m d = (m 4 – m 1 ) – (m 3 – m 2 ) = (55.4916g – 32.1403g) – (62.4722g – 40.3439g) = 23.3513g – 22.1283g = 1.2230g Volume of water displaced v w = m d / ρ ρ @ 20° C = 0.9982 g/mL v w = 1.2230g/ 0.9982g/mL = 1.225 mL Density of Unknown ρ s = m s / v s in g/mL = 8.2036g/1.225 mL = 6.697 g/mL Q Test 5.639 g/mL, 10.406 g/mL, 6.697 g/mL, 61.655 g/mL, 6.1106 g/mL (61.655 – 10.406) / (61.655 – 5.6396) = 0.91 This means that 61.655g/ml is an outlier (10.406 – 6.697) / (10.406 – 5.639) = .79
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Density of a Solid Lab - Stephanie Warner Chem 153 Shidong...

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