Equipment and Setup The apparatus we will be using consists of a syringe, test-tube clamps, ring stand, C-clamp, and assorted masses. As you can see in the image to the right, you will be capturing a small amount of air in the syringe by closing the attached hose clamp. Before starting, I recommend that you tape the tops of the metal hanger together so that they can not be pulled out of their plastic slots during the lab. You should also lubricate the rubber edges of the plunger that make contact with the inside of the syringe. Do NOT lubricate the interior of the syringe! As shown below, you should clamp the ring stand to the table and use two burette clamps to support the syringe so that it does not tilt as weights are added to the hanger. Measure the inner diameter of the syringe before you carefully inert the lubricated plunger. Then slide the plunger to a position between 10-11 ml and close the hose clamp. Next slightly depress the plunger a couple of times to establish its equilibrium position. It should bounce back to the same position. This will test to make sure that your apparatus is sealed and not loosing air. Before adding any masses, make sure that the syringe is stable and cannot move and that its metal hanger is hanging straight downward. Now you will make a data table of the amount of mass suspended from the hanger and the volume of gas in the syringe. You will start by suspending 0.250 kg and increase the mass by 0.100 kg increments until the mass hanger can not hold any further masses, or until the seal breaks and the plunger slides down to zero. It is recommended that you NOT remove and replace masses, but gently add each 100-gram slotted mass gingerly to the hanger. Relaxing the load to adjust and replace masses has resulted in the plunger losing its seal. Data |