Editing Vapor Pressure Lab - Revised 2015
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*In this lab, we will look at the intermolecular forces in the substance to predict which substance has the highest vapor pressure (thereby determining which has the greater boiling point). <b>Procedures</b><br> At your desk, determine the molecular polarity of xylene, (C<sub>8</sub>H<sub>8</sub>), methanol ( C<sub>1</sub>H<sub>3</sub>OH) and water.<br> <br> <br> <br> <br><b>In the lab</b><br> *Get a test tube rack and three large test tubes. *Get three balloons (do not do anything with balloons especially blow them up) *Get a 250ml beaker and fill it with approximately 150ml of tap water. *Turn on heating element and place 250ml beaker on heater. *In one large test tube, add approximately 2ml (w/pipette) of xylene, and then place balloon over top of test tube making sure to take all air out of balloon. *In the another large test tube, add approximately 2ml (w/pipette) of methanol and then place balloon over top of test tube making sure to take all air out of balloon. *Then in the final large test tube, add approximately 2ml (w/pipette) of water and then place balloon over top of test tube making sure to take all air out of balloon. *Make observation of the condition of the balloon. *Let heating element (hot plate) heat up the water bath & both of the test tubes (once boiling starts shut off heating element). Periodically, make observations on the condition of the balloons. *When done heating system, remove the 250ml beaker with test tubes from the heating element (either by using a glove or let beaker cool down enough to touch) and let it cool on the table top. *Observe the condition of the balloons after the water has cooled back down to room temperature. <br> <br> <b>Data Table</b> <br> *Initial observation of balloons in water bath: <br> *Periodic observation of balloons: <br> *Final observation of balloon after cooling back to room temperature. <br> <br> <br>
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