CH 204 – Introduction to Chemical Practice
Experiment #2 – Gas Laws
Jose De Arrigunaga*
Robert Gonzalez
TA: Ryan Ciufo
September 29, 2015
EXPERIMENTAL The power adapter was plugged into the left side of the LabQuest, and the pronged end was plugged into a power outlet. The LabQuest was turned on using the power button on the front of the device near the top left corner. The gas pressure sensor was plugged into Channel 1 of the LabQuest. “Sensors” was selected at the top of the screen, then “Data Collection.” The drop down arrow was clicked in the Mode box, and “Events with Entry” was selected. The Number of Columns was set to “1.” “Volume” was typed in the Name box, and “mL” was typed in the corresponding Units box. The syringe was prepared
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A stir bar was added to the bath to evenly heat the water, and the stirring was turned on. The gas pressure sensor was plugged into Channel 1, and the temperature probe into Channel 2 of the LabQuest. “Sensors” was selected at the top of the screen, then “Data Collection.” The drop down arrow was clicked in the Mode box, and “Selected Events” was selected. The Name was kept as “Event,” and the corresponding Units box was left blank. The open end of the plastic tubing was twisted firmly into place to the gas pressure sensor. The two-way valve on the rubber stopper was in the OPEN position, and the rubber-stopper assembly was inserted into a 125-mL Erlenmeyer flask. The two-way valve on the rubber stopper was closed. Once the water was boiling, a ring stand and a metal clamp were used to carefully submerge the flask assembly into the boiling water bath. The metal part of the temperature probe was placed into the boiling water. “Collect” was clicked to begin data collection. Once the pressure and temperature stabilized in the boiling water bath, “Keep” was clicked. The heating was turned OFF on the hotplate, and ice was added to the bath to cool it. “Keep” was clicked once the temperature of the bath cooled to 95°C. The procedure was continued as the temperature continued to decrease, and “Keep” was clicked at every 5°C increment until the bath reached 0°C. “Stop” was