PASCO ME-6940 Diffusion-Osmosis Apparatus - Manual (Page 6)

M o d e l N o . M E - 6 9 4 0 S a m p l e A c t i v i t y
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7. Connect a PASPORT Dual Pressure Sensor to the interface. Set up digits displays for Absolute Pressure 1, Abso-
lute Pressure 2 and 1-2 Differential pressure. Also set up a graph display for 1-2 Differential Pressure.
8. Reduce the sampling rate to 1 sample per minute.
9. Calibrate the Dual Pressure Sensor so that Absolute Pressure 1 and 2 equal 102 kPa (kilopascals) with both pres-
sure ports open to the environment.
10. If possible, set the interface to stop data collection after 24 hours.
11. Change the unit of measurement for time from seconds to hours.
12. Begin recording data. Leave the experiment setup in an "out-of-the-way" place where the ambient temperature
will remain relatively constant and the apparatus will be undisturbed for the duration of the experiment.
13. Record the initial volume of the solutions in the columns in Table 1.
14. Record the initial pressure of the solutions in the columns in Table 2.
15. Record the initial concentration of each solution in Table 3.
16. After 24 hours, stop recording data and save the experiment as directed by your instructor.
17. Carefully remove the blue caps and clean up as directed by your instructor.
Data
Table 1: Fluid Volume
Table 2: Pressure
Solution Initial Volume (mL) Final Volume (mL) Change in Volume
Absolute Pressure 1 Distilled water
Absolute Pressure 2 2.0 M Sucrose solution
Solution Initial Pressure
(kPa) Final Pressure
(kPa) Change in
Pressure Slope (kPa/hour)
Absolute
Pressure 1 Distilled water
Absolute
Pressure 2 2.0 M Sucrose
solution
1-2 Differential
Pressure (Abs. pressure 1 -
Abs. pressure 2)
Figure 4