LabReport1 - Introduction The purpose of Experiment 1 was...

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Introduction The purpose of Experiment 1 was to exercise the techniques of measuring various substances and the importance of calibration. Comparing and adjusting a measuring device helps ensure accurate measurements. In the second part of the lab experiment, measurements of mass and volume were to be obtained and analyzed in accuracy and precision, using the formula for the density of a substance. This is important in realizing error in experiments. Measurement taking exercised the ability in making controlled observations and interpretations. These measurements were to be collected and compared to apply the significance of accuracy and precision. An objective of this first lab experiment was to become familiar with lab equipment such as the pipet, buret, and analytical balance, as well as gain experience using the MeasureNet system. Using the instruments allowed for an observation in how a quantity changes in time. This knowledge concentrates on the transformation of matter and the accompanying energy changes. This experience is also useful for becoming accustomed to scientific experiments so that future laboratory procedures are carried out efficiently. Procedure The procedure followed by directions according to the lab manual: Sprague, Alexander, Padolik & Steffel, Laboratory Experiments for First Year Chemistry, 6th ed. pp. 1-6 to 1- 12. Results The data of this experiment included measurements such as temperature, mass, and volume.
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Part A: Calibrating the temperature probe involved the measurement water’s temperature before and after probe calibration. Uncalibrated water temperature: -0.29 °C Calibrated water temperature: 0.0°C The data for water temperature over time is given in Figure 1. The plot shows the change in temperature after heating the water. After 200 seconds, the temperature beings to level off and then decrease. Part B: Mass measurement of the crucible using the analytical balance was taken twice and recorded. Mass of crucible= 10.891 g; 10.822 g Mass of lid= 9.2323 g; 9.2333 g Volume measurements for the beaker, graduated cylinder, pipet and buret: Glassware Used Expected Volume Actual Volume Beaker 50 mL 50.722 mL Graduated Cylinder 50 mL 50.000 mL
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This note was uploaded on 10/01/2008 for the course CHEM LAB 111 taught by Professor Sprague during the Spring '07 term at University of Cincinnati.

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LabReport1 - Introduction The purpose of Experiment 1 was...

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