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Material: – Computer – Fernier computer interface – Logger Pro – Fernier Conductivity Probe – three 18×150 mm test tubes vivid rack – 10% salt beater – mill beaker – dialysis tubing, 2. CM CM Dropper pipette or Berea pipette. – Stirring rod – Ring stand and utility clamp Lab Procedure: 1. Connect the Conductivity Probe to the computer interface, and run Logger. 2. Put beaker on the Ring stand and pour mill water into beaker, 3. Et 1%, 5%, salt water in to three dialysis tubes Obtain 15 ml of 1%, 5% and 10% salt-water solutions in each tube. -Soak three dialysis tubes into beaker one by one, and tie one end of the dialysis tubes. -Else a Berea pipette, transfer IS ml of the and salt water into the dialysis tube -Tie tot the other end tube. ) 4. Put a weak magnet into the bottom of beaker. 5. Wait for 20 sec 6. Record by logger pro for 120 sec for 3 times (1%, and salt water each) 7. Observe and compare all the data 8. Get conclusion 9.

Put every thing back and trash all three-dialysis tube. Questions: 1. The more salt concentration, the higher rate of diffusion will have. 2. My conclusion proved my prediction is right. Almost no difference. 3. 5%to 1% = 8. 886 Conclusions The diffusion rate of a molecule is influenced by the presence of a second molecule. Proved this by using different salt concentrations and showing the result on the computer by Logger Pro. Also, The rate of diffusion would be higher as the salt concentration getting higher.

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