Densities of Liquids and Solids - Next was the unknown...

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Densities of Liquids and Solids By Lionel Sims III Lab Instructor: Roy September 14, 2007
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Results and Discussion: The densities of an unknown solid and an unknown liquid were attained through measurements and calculations and then looked over for human error, they were then assigned to a particular chemical based on a list of known densities. There were three people in my lab group, therefore there were three of each measurement. Unknown Solid Trial # Mass (g) Volume (ml) Density (g/ml) 1 8.347 1.2 7.0 2 8.347 1.3 6.4 3 8.346 1.5 5.6 We then used formulas to find the relative percentage of different trials. Then we found the percentage error for our measurements. With this data after calculations we were able to determine with a 11.27% error that the unknown metal solid in our experiment was zinc.
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Unformatted text preview: Next was the unknown liquid. Unknown Liquid Trial # Mass (g) Volume (ml) Density (g/ml) 1 9.353 10 .9353 2 9.352 10 .9352 3 9.352 10 .9352 *The data provided by the calculations from the unknown liquid gave very inconclusive results. It was necessary to re-measure and re-calculate to attempt a result closer to the given densities. Unknown Liquid Trial # Mass (g) Volume (ml) Density (g/ml) 1 9.255 10 .9255 2 9.254 10 .9254 3 9.255 10 .9255 With the new measurements we were able to determine with a percentage error of only 2.8% that the unknown liquid in our experiment was Ethyl Acetate. Conclusion The unknowns in our experiment were proven to be zinc and Ethyl Acetate....
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This note was uploaded on 04/18/2008 for the course CHEM 2070 taught by Professor Chirik,p during the Fall '05 term at Cornell University (Engineering School).

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Densities of Liquids and Solids - Next was the unknown...

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