Lab: Cell Membranes and Diffusion
Create a hypothesis based on your answers to the following:
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What would happen to a cell if the concentration of water inside the cell was less than the concentration of water outside the cell?
What would happen to a cell if the concentration of water inside the cell was greater than the concentration of water outside the cell?
Design and write out a procedure that will test your hypotheses.
Questions you might think about . . .
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What is your independent variable? Your dependent variable?
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What evidence will you accept as supporting/rejecting your hypothesis?
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How will you record and / or report your observations?
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What, if any, variables will you need to control?
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What equipment will you need to use?
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Remember to be specific about your procedure, so another scientist could replicate your experiment from the information you include in your lab report.
Available Materials
Dialysis tubing
String
Distilled water
Salt
Beakers
Stirring rods
Scale
Thermometers
1) What changes if any would you make to your experimental design? Explain.
2) Was your hypothesis supported or refuted? Explain your results.
3) What factors might affect the speed of water movement in or out of a cell?
4) Initially, did your cell float or sink? Specify the conditions under which your cells sunk and/or floated and provide an explanation for your observations.
http://www.quasar.ualberta.ca/edse456/apt/labs/diffusion.htm