Lab report 1-FINAL

# Lab report 1-FINAL - Densities of Liquids and Solids by...

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Densities of Liquids and Solids by Rachel Soffer Lab Instructor: Kaushik Nanda Sept 12, 2007

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Purpose: To design and implement a procedure to determine the densities of an unknown liquid and an unknown solid in the most accurate and precise manners possible. Results and Discussion: Density of H 2 O Three experimental trials were performed to find the density of distilled water (H 2 O). Density was calculated using equation D = V M an example of such a calculation using trial #1 data follows: D = V M = mL g mL g / 9897 . 0 10 9897 . 9 = The data and calculated results were tabulated (Table 1). Table 1: Density of H 2 O Data and Results Trial # Mass of H 2 O (g) Volume of H 2 O (mL) Density of H 2 O (g/mL) 1 9.897 10 0.9897 2 9.995 10 0.9995 3 9.983 10 0.9983 The mean ( x ) and average deviation ( x ) of density results were calculated: x = N x i i = mL g mL g mL g mL g / 9958 . 0 3 / 9983 . 0 / 9995 . 0 / 9897 . 0 = + + = - = N x x x i i mL g mL g mL g mL g mL g mL g mL g / 0123 . 0 3 ) / 9983 . 0 / 9958 . 0 ( ) / 9995 . 0 / 9958 . 0 ( ) / 9897 . 0 / 9958 . 0 ( = - + - + - Precision was determined by calculating the relative average deviation Relative Average Deviation % 100 × = x x % 235 . 1 % 100 / 9958 . 0
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