Preview

Glucose Sucrose Osmolality

Better Essays
Open Document
Open Document
1369 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Glucose Sucrose Osmolality
Abstract
Literature on Van’t Hoff’s law states that water potentials and zero weight change osmolalities will be the same for potato cores placed in varying concentrations of solutes of NaCl, glucose, and sucrose. This experiment was designed to test these predictions and compare them to data gathered course wide. We found that the mean water potentials were all within 0.26 bars of each other, and that the zero weight change osmolalities were all within 0.035 mols of each other. This supported Van’t Hoff’s predictions that water potentials and osmolalities would be the same. We had to collect potato core samples in order to do this, and measure and dry them. There were four three different solutes that the cores were placed in, each with varying
…show more content…
The solution my group used was NaCl, and we used varying concentrations to see if that would affect the osmolality of our potato cores. Our explanatory hypothesis was that concentrations of a solution and osmolality of potato cores would be unrelated. We predicted that even though there were varying concentrations of solute, potato osmolality would be unaffected. The purpose of the experiment was to test Van’t Hoff’s Law for ourselves, and see if-as a class-we came to the same conclusion he did. We also wanted to see if his prediction about differing solutes was true. To do this, each group in the class tested either glucose, sucrose, or NaCl and we entered our results in a graph that was presented on the projector. Our null hypothesis was that the estimated water potentials for the three solutes will be the same, and that the zero-change osmolality points will be the same for the three …show more content…
Kosinski’s website, we performed this experiment. We used a regular white potato for our experiment and used a corer to bore cores out of the inside of the potato. After drying the cores, they were weighed and placed in a solution of NaCl. After an hour and a half, they were taken out of the solutions, dried, and weighed again. We then ran a paired chi-squared test on our results and entered them into a class-wide table and graph. The materials used were: two potatoes, a potato corer, a scale, and beakers of varying concentrations of solute.

You May Also Find These Documents Helpful

  • Good Essays

    This overall flow of water from a dilute area of high water potential to a more concentrated solution of low water potential across a partially permeable membrane is called osmosis. I predicted that the swede cylinders which are put in a test tube with a low potential of sucrose solution would become turgid because the water molecules that are present in the swede will move away from an area of higher potential of water molecules to an area that has a lower potential of water molecules, this means that the swede sample will gain mass and become full almost to an extent where it is ready to burst. The swede samples that are going to be put in a test tube with a high potential of sucrose solution will become flaccid because the swede cylinder will have a higher potential of water molecules and so these molecules will diffuse into the sucrose solution as it has a lower water potential, this means that the potato sample will shrivel and loose mass.…

    • 1139 Words
    • 5 Pages
    Good Essays
  • Better Essays

    Biolab 1208 Lab Report

    • 840 Words
    • 4 Pages

    The purpose of this experiment is to calculate the mass/change in mass of plant tissue, in our case potato tubers. The change in mass of the potato tuber disk determines the osmotic concentration. After soaking the potato tubers in different concentrations of sucrose, then calculating the percent change in mass, we can determine the osmotic concentration. The…

    • 840 Words
    • 4 Pages
    Better Essays
  • Satisfactory Essays

    Bio 101 report

    • 288 Words
    • 2 Pages

    We took three piece of potato and placed them in three beakers with the same quantity of water but with different concentrations, results are:…

    • 288 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Easy Peasy

    • 401 Words
    • 2 Pages

    It was difficult to ensure that the same amount of potato was added to each test tube. Hard to add solution of H2O2 at the same time to see reliable results.…

    • 401 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    This exercise involves estimating the osmotic concentration of potato tuber cells by using a change in mass method. The null hypothesis states that there will be no change of mass of the potato disks after they have been incubated in any sucrose solution. This means that the concentration of sucrose that the potatoes are in will no effect the movement of water in or out of the potato cells. However, the alternative hypothesis states that the mass of the potato disks will increase after they have been incubated in a hypertonic solution. The mass of the potato disks will decrease after they have been incubated in a hypertonic solution. After the results have been gathered, appropriate estimations can then be made as to what the osmotic concentrations of the potato tuber cells are. Osmotic concentrations will either be hypertonic, hypotonic or isotonic depending on the results of mass change of the potato tubers.…

    • 367 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Lab 1C - using the potato core borer, obtain 24 cylindrical slices of potato, four for each cup. Determine the mass of the four cylinders. Immerse four cylinders into each of the six beakers or cups. Let stand overnight. After time is up, remove the cores from the sucrose solutions and mass them. Record all data in its appropriate table.…

    • 2756 Words
    • 12 Pages
    Good Essays
  • Best Essays

    Biology Eei

    • 3499 Words
    • 14 Pages

    The aim of this experiment was to test the effect of surface area on osmosis and the effect of solute concentration on osmosis. To test this aim to hypotheses were devised. 1) If potato pieces are immersed in various salt solutions, then the pieces with the greatest surface area to volume ratio will experience the greatest weight change, because more water can move by osmosis across the potato cell’s semi permeable membrane. 2) If potato pieces are immersed in various salt solutions, then the pieces immersed in the most concentrated solution will experience he greatest weight change, because more water must pass across the potato cells semi permeable membrane by osmosis to achieve an equilibrium. The results from testing these hypotheses did not support either and were shown to be flawed because they did not reflect the theories of osmosis relating to surface area to volume ration and salt concentration.…

    • 3499 Words
    • 14 Pages
    Best Essays
  • Good Essays

    Snowy Research Paper

    • 317 Words
    • 2 Pages

    It is one of the most largest and complex hydro-electric schemes in the world it contains; 80 kilometres of aqueducts, 140 kilometres of tunnels, 16 large dams and seven power stations, two of which are underground. The project commenced under an Act of Federal Parliament in October 1949 with the goal of diverting the Murrumbidgee, Snowy and Tumut Rivers in south western NSW to provide irrigation water for the western side of the Great Dividing Range, and in the process generate hydro-electric power.…

    • 317 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    Potato Osmosis Paper

    • 587 Words
    • 2 Pages

    Once the potato was cut into a cube shape, it was placed into a container with water. Salt was then added to the excavated part of the potato. The potato was firm and had its natural color in the beginning of the experiment. Within the first hour the water turned light orange/pink in color. The exposed part of the potato also began to change color from its natural beige to light brown. The top part of the potato began to slightly lose its firm shape.…

    • 587 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Osmosis Lab Response

    • 310 Words
    • 2 Pages

    The purpose of the lab was to discover, through osmosis, the concentration of sugar water in a potato. First, potatoes were cut into strips about 3 centimetres in length and six strips were individually massed. Next, the six strips were placed in 6 different Dixie cups, labelled A, B, Q, X, Y, and Z. Each of the Dixie cups were then filled just enough to cover the potato strips, with substances that matched the letters of the cups. About 24 hours later, the potatoes were taken out of the Dixie cups and were individually massed again. The resulting data is as follows.…

    • 310 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    vugj

    • 460 Words
    • 2 Pages

    Introduction: Osmosis is the diffusion of water from a higher concentration to a lower one through a semi-permeable membrane and occurs in the cells of organisms. It is affected by the addition of solute which would lower the water potential, making water potential and solute concentration inversely related. The concept of osmosis loosely described is that the presence of more solute outside the cell means the presence of less solvent (or water molecules in this case) and vice versa; the goal of osmosis is for the water molecules inside and outside of the cell to be equal, causing equilibrium and a stop to net water movement. The goal for a recent lab was to test whether cubes of potato would gain or lose weight depending on the amount of molar concentration of sucrose they soaked in. Solutions made of different molar concentrations of the solute sucrose were prepared before this lab. Potato cubes were weighed and recorded as the initial mass in the data. Four cubes of potato were placed into 100 mL of each solution and let stand overnight. The cubes were then taken out for the final total mass to be measured and recorded. In this experiment, the potato cubes were the dependent variables, and the molar concentrations were the independent or manipulated variables.…

    • 460 Words
    • 2 Pages
    Good Essays
  • Powerful Essays

    PotatoLabReport

    • 1275 Words
    • 6 Pages

    interior of the cell. The process by which water crosses membranes from region of high water concentration to regions of low water concentration is called Osmosis. Osmosis is the process whereby water moves across a cell membrane by diffusion. Diffusion takes place when the molecules of a substance tend to move from areas of higher concentration to areas of lower concentration. Cells must tightly control the process of osmosis otherwise they will die. Plants with too little water will wilt. This happens when water moves out of the cells by osmosis. Without this water there is little pressure inside the cell and the plant can no longer support itself against the pull of gravity.This experiment is to find out the water potential of potato cells . Water potential is the ability of water to move down gradient of water potential through partially permeable membrane until the gradient is constant.The purpose of this investigation is to see how a plant , in this case a potato , reacts to different concentrations of sucrose. Hypothesis:If we place potatoes in sucrose solutions then as the concentration goes up, the change in…

    • 1275 Words
    • 6 Pages
    Powerful Essays
  • Good Essays

    Osmosis Lab Report

    • 680 Words
    • 3 Pages

    In the wake of pushing potato center out from center barer, we needed to cut potato center into two equivalent amounts of. Thereafter, we quantified each center with a plastic ruler by millimeters, recording the length and the measurement of each. Furthermore, we needed to feel the potato centers and clarify how they felt before placing them into two unique sorts of an answer so we would have the capacity to find the progressions. Every half at that point set into two separate holders with one loaded with a salt arrangement and the other with refined water. An import detail what we need to recall was to cover the potato centers completely with their answer, else, we wouldn't have the capacity to get right outcomes.…

    • 680 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Potato Lab

    • 663 Words
    • 3 Pages

    Potatoes are just your average food; they have been around for as long as the human race can remember. In this lab we will make them be a prime example of osmosis, which is a transport mechanism. In this lab the problem being tested was what environment affects the mass of the potatoes the most. The independent variable is the environments used salt, water and iodine solution. The dependent variable is the mass of the potato after being exposed to the environment for 5 days. The control was a potato in no specific environment, meaning it is just sitting in air, no salt and no water/iodine solution. If the potato is exposed to a specific (hypotonic/hypertonic) environment then the mass will increase/decrease because the cell will grow or shrink due to the environment exposed to.…

    • 663 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Potato Osmosis Lab Report

    • 432 Words
    • 2 Pages

    We started the lab by cutting the potato core length (44 mm). Each potato core are placed in test tubes. The test tubes have different salt concentration, test tube 1 has 0% salt concentration, test tube 2 has 0.625% salt concentration, test tube 3 has 1.25% salt concentration, test tube 4 has 2.5% salt concentration and test tube 5 has 5% salt concentration. The next day, we remove the potato core from the test tubes and measure their size. In test tube 1 with a 0% salt concentration, the potato core length after is 44 mm, the change in potato core length is 4 mm so the potato is hypertonic to that solution. In test tube 2 with a 0.625% salt concentration, the potato core length after is 42 mm, the change in potato length is 2 mm so the potato is hypertonic to that solution. In test tube 3 with a 1.25% salt concentration, the potato core length after is 39 mm, the change in potato length is -1 mm so the potato is…

    • 432 Words
    • 2 Pages
    Satisfactory Essays