Adriann lausen demi dobbin ap bio 3 mrs houseman 20

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Adriann Lausen Demi Dobbin AP Bio # 3 Mrs. Houseman 20 September 2019
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Table and Graphs: Table 1: Solutions Water Weight Before Substance Weight Before Water After Substance After Sucrose 109.2 9.5 96.5 14.8 Albumin 109.2 8.9 100.8 11.0 Salt 109.2 12.6 98.8 12.5 Dextrose 109.2 7.9 98.3 8.3 Control 109.2 9.9 101.4 9.5 Graph 1: * This graph shows the weight of the solutions before and after they had time to diffuse. Discussion: After interpreting the data, it does prove the hypothesis correct. The fact that the salt water weight became less proves that high concentrated solutions diffuse into low concentrations. However the data does sway from the original expected results. Many of the high concentrated substances did not diffuse out our actually gained weight in the 42 hours. This can Adriann Lausen Demi Dobbin AP Bio # 3 Mrs. Houseman 20 September 2019
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be explained by the fact that the particles trying to move and diffuse were simply too big to pass through the dialysis bag. But in a real cell other measures would have been taken to accommodate for the large particles trying to pass through, for example the sodium potassium pump. Error Analysis: The sources of error in this lab were not tying off the dialysis bags well enough and not putting the exact amount of substance in each bag. This would be a problem because if the dialysis bags are not tied off well enough then the substances will leak out into the water and the results will not be correct and if each bag is not filled with the same amount then it can be hard to compare the different lab results. This can be prevented by making sure the bags are completely tied off and are filled with the same amount of substance in each dialysis bag. Procedure 3: The Effects of Osmosis in Living Cells Introduction: 1. The question investigated in this lab is how different solutes move in and out of living cells. Some common words that should be known in this lab are: Isotonic, Hypertonic, and hypotonic. “Water moves readily across cell membranes through specific protein- lined channels, and if the total concentration of all dissolved solutes is not equal on both sides, there will be a net movement of water molecules into or out of the cell. Whether there is a net movement of water into or out of the cell and which direction it moves depends on whether the cell’s environment is isotonic, hypotonic, or hypertonic”( Pearson). This definition from Pearson really explains what is happening in this lab and how it relates to the question the is trying to be answered. The theory in the experiment is that the solute will flow in or out of the potato depending on whether or not the concentration is equal on both sides of the potato. 2. The basic design of this lab is that there will be 5 solutes that are all different and the potato will be put in every one. We will then test how it reacts differently in all 5. The independent variable in this experiment is the potatoes in each different solute and the dependent variable is how the potatoes will react after being put in the solutes for a set amount of time.
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