Abstract Lab 7

Abstract Lab 7 - interval, the unknown liquid should be an...

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General Chemistry laboratory, Chem18 Experiment # 7 Date of Experiment: 11/8/2011 Date of Submission: 11/15/2011 Abstract: This lab was performed in four parts: the first part determined the density of a given unknown liquid, the second part used micro boiling-point determination to determine the boiling point of the unknown liquid, the third part used ISIS Draw software to draw the skeletal structures of the eleven possible unknown liquids, and the last part used FT-IR instrumentation to measure the infrared spectrum of the unknown liquid. The first two parts established an average density of 0.893 g/mL and an average boiling point of 79 ̊ C. The 95% confidence interval of the density was (.880, .906) and (77, 80) for boiling point. This means that both of the measured values lie within the interval, and reported with 95% confidence, the true value of the density and the true value of the boiling point are within their respective intervals. According to the confidence
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Unformatted text preview: interval, the unknown liquid should be an ester, as only the esters are anywhere near the measured density and boiling point values. The top three possibilities of the unknown liquid were ethyl acetate, isopropyl acetate, and normal propyl acetate based on the relative errors of accuracy of the liquid. The relative errors in accuracy were as follows: 2.7% for ethyl acetate, 11% for isopropyl acetate, and 22% for normal propyl acetate. Therefore, the only real possibility is ethyl acetate, as the other two liquids have substantial errors in accuracy, and none of the other liquids come close to the confidence interval or both measured values. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name Liz Zharovsky Bench C19 Lab day and section Tuesday - 2 TA Ramyaa Mathialagan Partner N/A Title: States of Matter...
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This note was uploaded on 01/23/2012 for the course CHEM 18a taught by Professor Dolnik during the Fall '06 term at Brandeis.

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