Solute Cocentration vs. Water Movement over a selectively permeable Membrane
...to hypertonic, or into the dialysis bag. For this lab, we followed the guidelines set up for us by the AP Biology Lab Manual, Third edition, pages 4-8. We made one change to the lab, allowing our dialysis bags to sit for 25 minutes instead of 30. The data from our experiment is presented in Table 1. The graph in Table 1 shows that the relationship between the change in mass and the molarity of sucrose is a linear relationship. To produce a comparable number in this lab, we used percent change {(final mass-initial mass/initial mass)x 100}. Our data obtained, for the most part, reflected our hypothesis. The only solution that did not was 1.0 molar sucrose solution. Because of the linear relationship described previously, a general statement of fact can be made. As molarity increases, the percent change in mass should also increase. This was not the case with 1.0M solution. This could be explained by actual errors within completing the lab, like not getting accurate mass measurements. Lab accuracy is of the utmost importance if you want to get accurate results. The percent change calculation is very important in this lab. Just showing the change in mass ...