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The membrane of a cell functions as a barrier and also as a gateway where waste is discharged and essential materials enter A membrane that allows only some molecules pass through is called semipermeable In this lab we are investigating the passage of materials though semipermeable membranes by passive transport molecules passing driven by thermal energy The dialysis bag was a semipermeable membrane Although water molecules will move in both directions across the membrane more will move from the side with the higher concentration to the side with a lower concentration This is called diffusion The diffusion of water molecules across a semipermeable membrane is called osmosis Hypertonic has a greater concentration of solute while hypotonic has less solute In the first part of the lab we tested the diffusion of the glucosestarch solution and the water-IKI solution For the second part of the lab we tested how diffusion of the sucrose solution would affect the potato cores Finally by using the knowledge we obtained from these labs we created a test and tested unknown solutions to find their sucrose concentration Our hypothesis for the first lab is that we expected the cup with the water and IKI solution to turn black-brown with the starch present For second two labs we predicted the majority of the final weight of the potatoes would be water over sucrose MaterialsPlastic cupDialysis bagGluosestarchIKICork borerPotato00 M 10 M sucrose colutionPlastic wrapRubber bandMethodsFor the diffusion lab we filled a cup with distilled water and added approximately4 mL of IKI solution Then we added a dialysis bag into the solution that contained 15 mL of glucosestarch tying it off over the side of the cup We recorded the color of the solution in the cup by testing to see if there were starches present In the plant cell and water potential lab we filled six cups with a range of solutions from 00 M 10 M sucrose evens We used
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