Essay on Thermodynamic Investigation of the Joule-Thompson Effect

2. Read and record the temperature of the gas using the thermometer attached to the container.

The purpose of this lab was to determine the effect of temperature on the volume of gas when the pressure is consistent and to verify Charles’ Law. The data from the experiment reveals that as temperature increases, so does volume. This also indicates that as temperature decreases, the volume decreases as well.

Please Note: This lab involves a lot of waiting for the gas collection. Make sure you allot yourself the full three hours to perform the experiments.

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

Figure 1: Amount of O2 gas curves to the time at which it was measured according to low, medium, and high pH.

The purpose of this experiment is to investigate some physical and chemical properties of gases and to use these properties to identify these gases when they are encountered.

After doing this activity, I observed that as temperature decreases so does the pressure. This isn’t something that you can control. Rather, it is something that naturally happens. When the first two examples were done, I noticed that there was a slight trend between the ending pressures as the temperatures decreased. For instance, at 70 degrees the temperatures were both 12.5 psi because that was the initial pressure of course. However, at 63

1. Start Virtual ChemLab and select Boyle’s Law: Pressure and Volume from the list of assignments. The lab will open in the Gases laboratory.

the test tube. On the temperature graph, the highest point was at 27ºC, which means that

Figure 3. Diagrammic representation of how the apparatus should be set up to heat the de-ionized water, in which carbon dioxide gas would be dissolved afterwards in a gas syringe, to a selected temperature with the aid of temperature measurement by thermometer

Experiment/Result/Analysis: In activity 17.8.1, we related volume and temperature, we had a empty beaker with air and a temperature probe in it, sealed with a rubber stopper that was connected to a syringe. We placed the beaker in cold water with a immersion heater and recorded the data on LoggerPro. As the water heated up, we observed that the pressure of the air remained constant because the temperature is also changing. We fit our data with a linear curve and concluded that the change in volume is directly proportional to the change in temperature.

In the fourth stage of this experiment, the density of a gas was determined. A 250ml flask was weighed with an empty rubber balloon and the mass was recorded.

When your graph is completed, click the camera icon () to take a snapshot. Paste the image into a blank word-processing document, and label the graph “Volume vs. Pressure.”

4. Remelt the contents of the tube and add the counterpart component based on the given schedule. Ask the demonstrator to adjust the cooling water between mixtures. During the experiment, record and plot the data obtained for all mixtures listed. The experiments are stopped as follows:

11) The gas accumulation in the balloon was measured and recorded at one minute intervals for a total of 10 minutes (qualitative observations were included)