Lab Report Module 2

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Antonio Aguilera October 5, 2014 (Partner: Colin Guthrie) Report 1: Measurement: Understanding Accuracy and Uncertainty, Measuring Liquids, Weighing Solids, and Using Density in Calculations Introduction Volume measurements will be used to determine the volume of one drop of water.1 Mass and density of water will be used to determine the accuracy of three pieces of common glassware.1 Mass and volume measurements of solids will be used to determine the density and identity of two metals.1 The impact of chemical residue will be explored for liquids and solids.1 Procedure and Data statement The complete experimental procedure is available in the General Chemistry Laboratory Manual for CSU Bakersfield, CHEM 211, pages 10-25.1Experimental data are recorded on the attached data pages. Discussion The class average for the volume of a drop of water for the 80-drop count was 0.038 mL a drop and 0.036 mL a drop on the 120-drop count. The uncertainty for both drop counts was ± 0.05 mL. When compared, the 10 ml graduated cylinder is the most accurate tool for measurement the volume of a liquid. The uncertainty for the 10 mL graduated cylinder is 0.14 mL; on the other hand, the 50 mL graduated cylinder has an uncertainty of 0.366 mL, and the 100 mL an uncertainty of 6.391 mL. The identities of the two metals are determined to be aluminum (C) and iron (E). The volume was determined by using the water displacement method. The density for Al (c) was found to be 2.7 g/mL with an uncertainty of ± 0.2076 g/mL. The density for Fe (E) was found to be 7.26 g/mL with an uncertainty of ± 0.5183 g/mL. The theoretical density for aluminum is 2.7 g/mL and for iron it is 7.86 g/mL.1 When water, or any other substance, is transferred from one container to another, it leaves behind a residue. The glassware was found to retain the colored water as its chemical residue. The
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