Diffusion Coefficient Apparatus Essay

general Start-up Procedure Prior to running an essay, students argon advised to perform the following startup procedure. Fill the water with reasonable (preferably filtered) water to approximately 20 mm from the efflorescence. Plug the main(prenominal) line of reasoning to the electrical supply. Be sure that the voltage of the supply is correct to suite the equipment. shed on the main power on the control panel. mark the coiffure-point appreciate on the temperature controller to 500C.WarningDo non set the temperature controller beyond 700C.Switch on the heater. Observe the water temperature heats up to 50 0C and remain constant.The equipment is now ready for experiment.Priming procedure for pateillary vessel TubeBefore employ the capillary thermionic valve in an experiment using acetone, students are advised to clean the in look of the tube. Prepare a weak solution of detergent. Use the Hirschman pipette to fill the tube with the solution. Tapping the of side of the tu be may be necessary if the solution is trapped and does not flow beat. Turn the tube upside-down and shake. Empty the tube. Repeat st contrasts 2 to 3 with acetone. The tube is now ready for student experiment.General Shut-down Procedure After the completion of an experiment, students are advised to shut down the equipment as follows Switch off the heater and air pump. Adjust the set-point value of the temperature controller to approximately 5 degree below the room temperature. include the water to cool down until it is safe to touch. Open the drain valve and empty-bellied the water tank. Detach the flexible render and clean the capillary tube for next use. (Refer to priming procedure) Switch off the main power. Unplug the main cable if the equipment will not be used for a extensive period.EXPERIMENTOBJECTIVETo determine gas diffusion coefficient of acetone using the established Winkelmanns method.Procedure1. Perform the start-up procedure.2. Partially fill the capillary tube w ith acetone to a depth of about 35 mm.3. conservatively insert the capillary tube through the fitting on the top of the water bath cover. Do not over-tighten the fitting.4. Observe the initial take of acetone through the telescope. Record the level of acetone.5. Connect the flexible tubing from the air pump line to one end of the capillary tube. Switch on the air pump.6. After 30 minutes, switch off the air pump. Disconnect the flexible tubing and close the two capillary tubes ends with the cap provided. Observe and record the level of acetone.7. Repeat steps 4 to 6 at 30 minutes intervals.ANALYSIS & DISCUSSION maculation t/ (L-L0) against (L-L0).Determine gas diffusivity, D from the obtained slope, S. Compare the experimental value with the theoretic value that can be predicted from empirical equations (e.g. modified Maxwells equation by Gilliland).