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Name: Jeff Vinet Lab Instructor: Jungnam Lee Lab Section: 21 General Research Question How does the molarity of a solute affect the rate and direction of the osmosis through a potato cell membrane, thereby affecting the mass of potato cells? Hypotheses Null Hypothesis: The molarity of the solute will have no effect on the mass of the potato cells. Alternative Hypothesis: The mass of the potato cells will be affected by the various molarities of the solutes due to osmosis. The lower molarity solutes will increase the potato mass, while the higher molarity solutes will decrease the potato mass. Results On average, the percentage change in mass tends to decrease as the solute approaches 0.25 M and increase after 0.25 M has been reached. What are the important results relative to your hypotheses? Results
Potato Cell Mass
30 20 10 0 -10 0 -20
) % ( s M i e g n a h C 0.1 0.2 0.3 0.4 0.5 0.6 -30 Molarity of Solute Discussion The results of the experiment supported the alternative hypothesis of molarity of the solute affecting the potato mass. The results disprove the null hypothesis. When exposed to hypotonic solute, the mass of the potato cells increased. Alternatively, when exposed to hypertonic solute, the mass of the potato cells decreased. Discussion The results exhibit the same pattern as other results of the same experiment. As the solute increases in molarity, the percent change in mass decreases and becomes negative, indicating a decrease in mass. The results of this study functioned as an example as to how osmosis works. The next step in the study could be to change the variables to see if it changes the results. Discussion ...
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This note was uploaded on 04/06/2008 for the course BIOL 1209 taught by Professor Lee during the Fall '07 term at LSU.
- Fall '07