Chemistry Lab 4-4

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Boiling Point Elevation

4-4 Boiling Point Elevation
If you dissolve a substance such as ordinary table salt (NaCl) in water, the boiling point of the water will increase relative to the boiling point of the pure water. In this assignment, you will dissolve a sample of NaCl in water and then measure the boiling point elevation for the solution.
1. Start Virtual ChemLab and select Boiling Point Elevation from the list of assignments. The lab will open in the Calorimetry laboratory with a calorimeter on the lab bench and a sample of sodium chloride (NaCl) on the balance.

2. Record the mass of the sodium chloride in the data table. If it is too small to read, click on the Balance area to zoom in, record the reading, and then
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Repeat the experiment with this gas labeling the data link as ‘Ideal Gas 8.’ 5. Zoom Out by clicking on the green arrow next to the Save button. Click on the Stockroom and then on the Clipboard and select Balloon Experiment N2. Again, set the temperature, pressure, and moles to 298 K, 1.00 atm, and 0.300 moles, respectively. You may have to click on the Units button to change some of the variables to the correct units. Repeat the experiment with this gas labeling the data link ‘Real Gas N2.’ 6. Select the lab book and click on the data link for Ideal Gas 1. In the Data Viewer window, select all the data by clicking on the Select All button and copy the data using CTRL-C for Windows or CMD-C for Macintosh. Paste the data into a spreadsheet program and create a graph with volume on the x-axis and pressure on the y-axis. Also create a graph for your data from Ideal Gas 8 and Real Gas N2. 7. Based on your data, what relationship exists between the pressure and the volume of a gas (assuming a constant temperature)?

The pressure of a gas sample increases for a decrease in volume and decreases for an increase in volume. 8. ISBN: 0-558-05245-2 Virtual ChemLab: General Chemistry, Student Lab Manual/Workbook, V. 2.5, Third Edition, by Brian F. Woodfield and
Matthew C. Asplund. Published by Prentice Hall. Copyright © 2006 by Pearson Education, Inc.
Gas Properties 9. Look up a
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