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2 if necessary place the plunger back into the barrel

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Unformatted text preview: lungs in an effort to get more air. Now, of course, we have a problem, because as the patient breaths harder, they are doing more work. This requires more oxygen as well as producing more carbon dioxide which must be eliminated more quickly (also affected in an analogous manner as oxygen), which will require the patient to breath even faster through restricted airways in order to get the extra oxygen and eliminate the excess carbon dioxide. Can you imagine what that must be like? Dakota State University Page 129 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Experimental Methods: This experiment is broken down into three parts, one to demonstrate Boyle’s Law, one to demonstrate Charles’ law, and the other to demonstrate Poiseuille’s Law. It does not matter which you choose to do first. Wear your eye protection and aprons at all times. Follow all safety guidelines strictly. Boyle’s Law: Obtain a modified “Leur Lock” portion of a syringe, its plunger and a ruler. If the syringe has a plunger already partially in it, return it for a syringe which has no plunger in it! The syringe has been modified in two ways; first, no needle is available. Second, the end of the syringe has been sealed off to prevent air from escaping out of or going into the barrel once the plunger is in place. 2. If necessary, place the plunger back into the barrel. Test the syringe for air leaks by pressing the plunger with your thumb as far into the syringe as possible. Carefully listen for any hissing sounds. If you hear any hissing sounds, or if the plunger does not return to the top of the syringe on release at any point in the experiment, the syringe has an air leak and will not work. Report this to your lab supervisor and get a new syringe. 3. Remove the plunger from the syringe and carefully measure the inner diameter of the syringe with a ruler. Record your results in centimeters on the report sheet. Replace the plunger. 4. Using an adjustable clamp, fasten the syringe vertically to a ring stand. The syringe must be attached with the plunger on the top such that a mass can be balanced on top of the plunger. Make sure the syringe is as vertical as possible. 5. Obtain a book with a known mass from the instructor. Record the mass of this object in grams on the report sheet. 6. Carefully balance the object on the flat surface on top of the plunger. You want this object to be balanced such that it is not touching anything and can sit on the syringe without falling. This will require patience. 7. Once the object is balanced, push down on the object slightly to force the plunger down. Release and allow the plunger to rise back up. When the plunger has stopped moving, allow it to sit undisturbed for about 10 seconds. 8. Carefully read the volume of the syringe from the scale on the syringe barrel to the nearest mL. Be careful not to let the book fall on you if it should fall off of the syringe! Record this volume in mL on the report sheet. 9. Remove the object from the plunger and allow it to return...
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