3 place the plunger in the ice bath for several

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Unformatted text preview: to the top. If any sign of a leak ever appears throughout this experiment, report it immediately to the lab supervisor. 10. Repeat steps 4 through 8 for at least 5 different masses. Dakota State University Page 130 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Charles’ Law: Obtain a sealed syringe with a plunger already in place and a thermometer. Never remove the plunger from this syringe! If your does not have a plunger in it, return it for one that has the plunger already in it and positioned in the middle of the volume range. 1. Read the thermometer and record the temperature in degrees celcius. Caution!You’re your thermometer contains silver colored mercury, remember that mercury is toxic. Be VERY cautious when handling these thermometers to avoid breaking them. Should one break, do NOT attempt to clean the broken thermometer up yourself; report it to your lab supervisor IMMEDIATELY! Record this temperature in the Charles’ law table. Read the volume on the syringe and record it next to the room temperature. 2. Prepare an ice bath by filling an appropriate sized beaker about 2/3 full of ice and adding water almost to the top of the ice. As this is chilling, begin heating a second beaker to boiling over a Bunsen burner. Always be cautious when using an open flame or around hot water! 3. Place the plunger in the ice bath for several minutes, along with the thermometer. When the temperature on the thermometer stabilizes, record the temperature in the table. Read and record the corresponding volume from the syringe. 4. Once boiling, place the thermometer and syringe in the boiling water. CAUTION! Be careful NOT to allow the syringe to get too close to the edge of the beaker, or it will melt! Allow the thermometer and syringe to remain in the boiling water for several minutes. Once the temperature has stabilized, read the temperature and corresponding volume. Record these values in the table. 5. IF your lab supervisor has an additional temperature bath, ask him/her to put your syringe into it (CAUTION! This will be TOO cold for you to do without DIRECT supervision; if she/he is NOT standing nearby, wait until he/she returns before proceeding!). Ask the temperature, and record it while you wait for the syringe to cool. Read the volume of the syringe when you are instructed to do so. Poiseuille’s Law: There are several additional safety precautions to observe in this part of the experiment. Please read this section ahead of time and follow all additional precautions carefully. Although this part of the experiment involves no toxic chemicals per se, remember that all laboratory equipment and surfaces are contaminated with chemicals that can be toxic. Therefore, avoid contact of any of these items or anything that comes in contact with them with your mouth. You should have available to you at least three different types of straws with different diameters. 1. Obtain from your instructor one of each of the minimum of three straws for each member in your lab gro...
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