IB Biology Potato Lab

Biology Potato Lab Table 1 Trial Number Concentration of sucrose Solution (M) 0. 2 ml initial quid of Potato Core Slice(g) 0. 1 Final can 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 permute in Mass (g) 0. 1 Percentage Change in Mass (%) Standard 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 average of initial mass of potato core with 0. 2M theme 1 + 2 + 3 / 3 5. 8 + 11. 6 +2. 5 / 3 = 6. 6 To find average of final mass 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 lurch in mass in 0. 4M solution Final mass initial mass = convert in mass 7. 7 8. 3 = -0. 6 To find dowery 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 visible that with an increasing ingress of sucrose solution there is to a fault a decrease in the percent change in mass. The r? value of 0. 9416 represents that there is a good relationship in the information between the tightfistedness of sucrose solution and the percent change in mass. The relationship between the data can as well as be proven by the wrongful conduct ba rs, representing the standard deviation from the data points and the amount of uncertainty.With the small error bars we know that the data is reliable although as the last few points overlap this indicates that the data is similar. proof I found that as the assiduousness of sucrose maturationd, the change in mass and percentage of the change in mass decreased. This data did support the hypothesis, as we knew from the term osmosis. Osmosis is the process of diffusion of water molecules from an country of high concentration to cast down concentration. The concentration gradient between the potato and the sucrose solution consume to the amount of molecules coming in and out of the potato.Therefore, the data supports the hypothesis as when the water concentration was rase in the potato than in the sucrose solution, the water molecules moved through the semi-permeable membrane into the potato which caused it to give weight. With a higher concentration 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 supported 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. spot 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, speckle mostly concrete, had particular places where a few errors could have 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 era to complete the research laboratory, each group completed the lab with three diametrical sucrose solutions. At the end of collecting our data, our classes results were compiled together 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, causing a different amount of water molecules to be able to pass through and into the solution. This could prove the overall data to be unreliable. To fix this deviation, with more time a group can complete their own lab with the full data with a single potato. Another error is the factor of temperature. Temperature affects osmosis as with a higher temperature the molecules are moving faster, causing osmosis to increase.As we left our beaker s with the potato cores ins ide the class room overnight, the classroom temperature may have increased or decreased which would affect the rate of osmosis inside the beaker. Due to the fact that its September, we can assume that the classroom temperature would decrease overnight including the consequences that perhaps a window or inlet would have been left open. As the temperature in the classroom decreased, the rate of osmosis did as well. To fix this normal sportswoman error, the temperature of the classroom could be recorded as we placed the beakers around the classroom to be left.Overnight it would be do current that no windows or doors are left open, and that the temperature stays the same throughout the experiment. A domineering error has to do with the scales that were used. The scales were a necessity for this lab its important that theyre working correctly. While planning for this lab not at one point were the scales that we were using checked to bugger off sure that they were fully functioning. This could establish the scale giving off false numbers which changes our entire experiment. At the root before proceeding with the lab it must be made sure that the equipment is regularly checked and operative.To do so, we can take 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 letting the potatoes rest for one twenty-four hours 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 running 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. html McGraw-Hill. (2006). How osmosis works. Retrieved from http//highered. mcgraw-hill. com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works. html