IB Biology Potato Lab

Biology white potato Lab Table 1 Trial Number Concentration of saccharose Solution (M) 0. 2 ml Initial mint of Potato fondness Slice(g) 0. 1 Final Mass of Potato Core Slices (g) 0. 1 1 0. 0 7. 7 9. 3 2 6. 0 8. 1 3 6. 2 7. 4 4 10. 2 13. 2 5 8. 7 10. 3 6 4. 9 6. 0 7 9. 2 10. 4 1 0. 2 5. 8 6. 0 2 11. 6 12. 1 3 2. 5 3. 1 1 0. 4 14. 4 13. 9 2 2. 6 2. 8 3 8 6. 5 1 0. 6 7. 3 5. 3 2 10. 7 7. 3 3 9. 6 7. 4 4 2. 9 2. 8 1 0. 8 5. 6 3. 6 2 16. 0 13. 1 3 11. 5 5. 9 1 1. 7. 9 5. 4 2 10. 0 6. 7 3 9. 6 6. 2 4 4. 7 3. 2 Table 2 Calculations of Averages Concentration of Sucrose Solution (M) 0. 2 ml Average Initial Mass of Potato Core Slice(g) 0. 1 Average Final Mass of Potato Core Slices (g) 0. 1 alteration in Mass (g) 0. 1 Percentage Change in Mass (%) model Deviation of Initial Mass Standard Deviation of Final Mass 0. 0 7. 6 9. 2 1. 6 22. 3 1. 9 2. 4 0. 2 6. 6 7. 1 0. 5 6. 5 4. 6 4. 6 0. 4 8. 3 7. 7 -0. 6 -7. 2 5. 9 5. 7 0. 6 7. 6 5. 7 -1. 9 -25. 2 3. 5 2. 2 0. 11. 0 7. 5 -3. 5 -31. 7 5. 2 5. 0 1. 0 8. 1 5. 4 -2. 7 -33. 2 2. 4 1. 5Sample Calculations To find bonnie of initial book of potato core with 0. 2M resolvent 1 + 2 + 3 / 3 5. 8 + 11. 6 +2. 5 / 3 = 6. 6 To find average of final pile of potato core with 1. 0M solution 1 + 2 + 3 + 4 / 4 5. 4 + 6. 7 + 6. 2 + 3. 2 / 4 = 5. 4 To find dislodge in mass in 0. 4M solution Final mass initial mass = motley in mass 7. 7 8. 3 = -0. 6 To find percentage change in mass in 0. 6M solution Final initial / initial x 100 5. 7 7. 6 / 7. x 100 = -25. 2 Figure 1 The effect of sucrose solution on the mass of potato cores Figure 1 In the above graph, its telescopic that with an increasing compactness of sucrose solution there is to a fault a decrement in the percent change in mass. The r? tax of 0. 9416 represents that there is a good family relationship in the data in the midst of the preoccupation of sucrose solution and the percent change in mass. The relationship between the data can also be proven by the misunderstanding bars, representing the standard deviation from the data points and the bar of un veritablety.With the small fallacy bars we know that the data is reliable although as the last few points overlap this indicates that the data is similar. Conclusion I found that as the denseness of sucrose increased, the change in mass and percentage of the change in mass decreased. This data did support the surmise, as we knew from the term osmosis. Osmosis is the process of public exposure of water molecules from an ara of higher assiduity to degrade concentration. The concentration incline between the potato and the sucrose solution lead to the amount of molecules plan of attack in and out of the potato.Therefore, the data supports the hypothesis as when the water concentration was lower in the potato than in the sucrose solution, the water molecules travel through the semi-permeable membrane into the potato which caused it to gain weight. With a higher con centration of water in the potato, the result would be the opposite. Hence the prediction that the lower the concentration of sucrose, the higher the final weight of the potato was reinforced. The hypothesis is back up by the evidence of the graph. With a concentration of 0. M sucrose solution the increase in the change of mass was 1. 6g and a percentage change of 22. 3%. In comparison, the 0. 8M sucrose solution had a change in mass of -3. 5g and a loss of 31. 7%. Although in Figure 1 the r? value gives the impression that the data is very reliable, some of the error bars do overlap. While observing the data there are no outliers present, although when inspecting the change in mass the development between the 0. 8M concentration of sucrose and the 1. 0M numbers slightly increase when accurately they would continue decreasing.This whitethorn perhaps be the result of certain potential errors. Evaluation My results, part mostly concrete, had particular places where a few errors coul d keep back occurred as they diff from the hypothesis that with a higher concentration of glucose there should be a decrease in the change of mass. As our class only had a certain amount of time to complete the science testing groundoratory, each group finish the lab with three different sucrose solutions. At the end of collecting our data, our classes results were compiled unitedly to compare.An error is the fact that each groups statistics came from different potatoes. As different potatoes were used, the pores in the membrane of each potato are different, do a different amount of water molecules to be able to good-bye through and into the solution. This could prove the overall data to be unreliable. To quicken this deviation, with more than time a group can complete their own lab with the full data with a single potato. Another error is the constituent of temperature. Temperature affects osmosis as with a higher temperature the molecules are moving faster, causing osmos is to increase.As we go forth our beaker s with the potato cores inside the classroom all-night, the classroom temperature may have increased or decreased which would affect the rate of osmosis inside the beaker. out-of-pocket to the fact that its September, we can assume that the classroom temperature would decrease overnight including the consequences that perhaps a window or door would have been leftfield open. As the temperature in the classroom decreased, the rate of osmosis did as well. To fix this principle variation error, the temperature of the classroom could be recorded as we placed the beakers nearly the classroom to be left.Overnight it would be made sure that no windows or doors are left open, and that the temperature stays the same throughout the experiment. A regular error has to do with the home bases that were used. The scales were a necessity for this lab its beta that theyre working correctly. While planning for this lab not at unmatchable point were the scales that we were using checked to make sure that they were fully functioning. This could establish the scale giving off false numbers which changes our holy experiment. At the beginning before proceeding with the lab it must be made sure that the equipment is regularly checked and operative.To do so, we can consume an object that we can identify the weight of, and test it on the scale to make sure its correct. As an extension to this investigation, it could be completed again but testing osmosis with more of a variety of the amount of sucrose solution- it could exceed a concentration of 1M to extend to 2M. This experiment could also be completed using different time frames instead of permit the potatoes rest for one day they could be let stand for one hour, or two hours to test how osmosis works within this shorter time frame.To fix our errors stated above, we must first make sure that all of our equipment is speed properly and that the temperature of the room does not vary overnight. Bibliography Diffusion and osmosis. (n. d. ). Retrieved from http//hyperphysics. phy-astr. gsu. edu/hbase/kinetic/diffus. hypertext mark-up language McGraw-Hill. (2006). How osmosis works. Retrieved from http//highered. mcgraw-hill. com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works. html