Osmosis Start

Satisfactory Essays
Investigate osmosis between potato tissue and sugar solutions.

Aim: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato core of a given size 10mm

Hypothesis: Osmosis is defined as the net movement of water or any other solutions molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium, meaning that the molecules are randomly distributed throughout an object, with no area having a higher or lower concentration than any other.

Predictions: For this particular investigation I think that the lower the concentration of the sugar solution in the test tube the larger the mass of the potato will be. This is because the water molecules pass from a high concentration, i.e. in the water itself, to a low concentration, i.e. in the potato chip. Therefore, the chips in higher water concentrations will have a larger mass than in higher sugar concentrations.

Planning: I am going to experiment the effects of osmosis in potato cells using varying of sugar solution. The samples will be placed in 3 test tubes for every different sugar solution. The samples will then be left in the solution for 24 hours, taken out of the solution and measured in length.

Care will need to be taken when cutting the samples to length and acquiring the samples from the potato because a scalpel will be used to cut the samples to an exact length and an apple core borer will be used to obtain the samples. Both of these items used are very sharp.
The molarities used for the sugar solution will be 0% (water), 4%, 8%, 12%, 16%, 20%. 3 sets of

You May Also Find These Documents Helpful

  • Powerful Essays

    osmosis

    • 2394 Words
    • 15 Pages

    Osmosis in Plants Outline: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. Definition - Osmosis: Movement of a solvent (liquid) through a semi-permeable membrane separating solutions of different concentrations. The solvent passes from a less concentrated solution to a more concentrated solution until the two concentrations are equal. All…

    • 2394 Words
    • 15 Pages
    Powerful Essays
  • Good Essays

    Osmosis

    • 514 Words
    • 3 Pages

    concentrated area to a low concentrated area. Water is one molecule that can diffuse freely in a cell. Other molecules need assistance through the cell membrane through a process called facilitated diffusion. Osmosis moves from an area of low concentration to high concentration. In osmosis water moves in the opposite way. Water flow is determined by the concentration, not the nature of the solute. There are a couple of things to consider for diffusion to work. The size of the cell, permeability…

    • 514 Words
    • 3 Pages
    Good Essays
  • Better Essays

    Osmosis

    • 2813 Words
    • 12 Pages

    Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.[1][2][3] It may also be used to describe a physical process in which any solvent moves, without input of energy,[4] across a semipermeable membrane (permeable to the solvent, but not the solute) separating two solutions of different concentrations.[5] Although osmosis does…

    • 2813 Words
    • 12 Pages
    Better Essays
  • Powerful Essays

    Osmosis

    • 1102 Words
    • 5 Pages

    http://thegrabup.com/?p=811 Significance Of Osmosis (700-1200) Osmosis is a process of movement of solvent through a semi permeable membrane from an area of high water concentration to an area of low water concentration to equalize the concentration of solute to both side of the membrane. . Water is sometimes called "the perfect solvent," and living tissue (for example, a human being's cell walls) is the best example of a semipermeable membrane. Osmosis process as demonstrated below shows that when…

    • 1102 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    Osmosis

    • 744 Words
    • 2 Pages

    The Osmosis Scientific Paper Emily N. Charbonneau Grand Valley State University The point of this experiment was to observe if the different concentrations of sucrose would change the speed of osmosis. Osmosis is a process of a fluid that will pass through a semipermeable membrane into a solution which most of the time has a higher concentration. Osmosis will be demonstrated throughout the lab. The importance of osmosis in a plant and animal cell there is a cell membrane, which helps liquids and…

    • 744 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Osmosis

    • 560 Words
    • 3 Pages

    Osmosis Aim: To determine the concentration of cell sap in a potato cell. Osmosis is the movement of water through a semi-permeable membrane. It starts from a weak solution and becomes a more stronger solution until the concentrations on both sides are equal. To investigate the range of solutions needed to find the point at which the surrounding solution is the same as the cell sap in the vacuole.…

    • 560 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Osmosis

    • 10166 Words
    • 41 Pages

    Advanced Placement Biology ® AP Biology Lab 1 281 EDVO-Kit # Storage: Principles & Practice of Diffusion & Osmosis Store entire experiment at room temperature. EXPERIMENT OBJECTIVE The objective of this experiment is to develop an understanding of the molecular basis of diffusion and osmosis and its physiological importance. Students will analyze how solute size and concentration affect diffusion across semi-permeable membranes and how these processes affect water potential. Students…

    • 10166 Words
    • 41 Pages
    Powerful Essays
  • Satisfactory Essays

    Osmosis

    • 354 Words
    • 2 Pages

    Osmosis is the spontaneous net movement of solvent molecules through a partially permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides. It may also be used to describe a physical process in which any solvent moves, without input of energy, across a semipermeable membrane separating two solutions of different concentrations. Although osmosis does not require input of energy, it does use kinetic energy and…

    • 354 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Osmosis

    • 359 Words
    • 2 Pages

    Osmosis Osmosis is a special example of diffusion. It is the diffusion of water through a partially permeable membrane from a more dilute solution to a more concentrated solution – down the water potential gradient) Note: diffusion and osmosis are both passive, i.e. energy from ATP is not used. A partially permeable membrane is a barrier that permits the passage of some substances but not others; it allows the passage of the solvent molecules but not some of the larger solute molecules. Cell…

    • 359 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Osmosis

    • 460 Words
    • 2 Pages

    Investigation: A factor that affects the movement of water in and out of cells. Osmosis: movement of water from a region of high water potential to a region of low water potential through a partially permeable membrane. High water potential = lots of free water molecules, low solute concentration Low water potential = very few free water molecules, high solute concentration Factors That Affect the Movement of Water in and out of Cells * Solute concentration * If one solution…

    • 460 Words
    • 2 Pages
    Good Essays