The variables recorded for each potato piece are Lab Group Name, Sucrose Concentration (Molarity), Initial Mass (g), Final Mass (g), and Mass Change (%). Each column in the dataset is a variable and the cells in that column are the values of that variable. The next day, the potato pieces are removed from the solutions, blotted dry, and their final masses are recorded.Įach row in this tidy dataset contains an observation for a single potato piece. ![]() ![]() This may sound counter-intuitive, but the water molecules are still moving down a concentration gradient from an area of high water concentration (a dilute solution) to an area of lower water. Pieces of potato are cut to similar sizes, weighed, and then placed in one of the six solutions overnight. Osmosis is the process by which water molecules pass through a semipermeable membrane, from a less concentrated solution into a more concentrated one. As you can see in the above diagrams both cells are in a hypotonic solution. The solutions range from no solute to a high concentration of solute and are 0.0 (distilled water), 0.2, 0.4, 0.6, 0.8 and 1.0 molar sucrose. 1) Understand the basic principles of osmosis and will be able to define it. The solute is sucrose and the concentrations are measured in units of molarity. The experiment uses pieces of potato that are placed in six different solutions of water each with a different solute concentration. Hypertonic, Hypotonic, or Isotonic Diagram pertonic potonic Isotonic Please indicate which direction water would be expected to move, based on the solution, through the use of arrows ( t). Now imagine living in a house that has walls without any windows or doors. Imagine all the light they must let in on a sunny day. ![]() In this activity, we are going to explore osmosis by looking at a dataset produced with a classic classroom experiment. Transport Without Energy Simple Diffusion Facilitated Diffusion Letting in the Light Look at the big windows and glass doors in this house.
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