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Chem lab 1

# Chem lab 1 - Densities of Liquids and Solids by Alex...

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Densities of Liquids and Solids by Alex Wittenberg Lab Instructor: Saba Khan September 11, 2009

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Results and Discussion : The purpose of the experiment is to determine the densities of an unknown liquid and an unknown solid. To ensure that the procedure was done correctly, the density of water (a known density) was calculated. Density of Water Volume (mL) Mass (g) Density (g/mL) 10.0mL 9.721g 0.972g/mL 10.0mL 9.925g 0.993g/mL 10.0mL 9.901g 0.990g/mL Density was found using d=m/V d = 9.721 g 10 mL = 0.972 g / mL Average Density was found using the formula x = x i i å N x i i å = x 1 + x 2 + x 3 + ...+ x N 0.972g/mL+0.993g/mL+0.990g/mL = 0.985g/mL 3 The x = 0.985 g mL - 0.972 g mL ( ) + 0.993 g mL - 0.985 g mL ( ) + 0.990 g mL - 0.985 g mL ( ) 3 = 0.009 Relative Average Deviation= x x ´ 100 Þ 0.009 0.985 g mL æ è ç ö ø ÷ ´ 100 = 0.9% Percent Error was found using the formula: Observed - Accepted Accepted æ è ç ö ø ÷ *100 0.985 g / mL - 0.9982 g / mL 0.9982 g / mL æ è ç ö ø ÷ *100 =1.32% Since the calculated density of the water is very similar to the real density of the water, the above procedure is acceptable for the experiment.
Density of an unknown liquid

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