Potato Diffusion Lab - Amanda Lee and Sandy Phuong...

This preview shows page 1 - 3 out of 10 pages.

Amanda Lee and Sandy Phuong Diffusion in Potatoes Lab I. Research Questions: 1. What effect will placing potato cells in solutions of different tonicities have on the diffusion of water into and out of the cells? 2. Which has a higher cytoplasm solute concentration, sweet potato cells or Yukon gold potato cells? II. Background: Diffusion is when particles move across a membrane and it occurs when there is an uneven concentration of particles, so the particles move from areas of higher concentrations to areas of lower concentration ( Allott, 2014). Osmosis is a form of diffusion in which water diffuses through a selectively permeable membrane from a high concentrated region to a lower concentrated region. “This means that water moves between the exterior and interior of the cells to balance the concentration of solutes instead of the solutes doing it” (Shiwnarain, 2018). Tonicity is a measure of how much solutes is in a solution relative to another solution and it plays the role of determining how much water comes in or out of the cell in osmosis. When potatoes are exposed to certain types of solutions, they can be hypertonic, isotonic, or hypotonic. Hypertonic solutions have higher concentrations of particles than the cell, therefore water from the cell will exit in order to dilute the solution, reaching equilibrium. The isotonic solution is when all the particles are in equilibrium and have a balanced concentration. The hypotonic solution has a higher concentration on the inside of the cell and water enters the cell through osmosis to achieve balance. These types of possible solutions could occur when the potatoes are placed in different solutions. Different types of potatoes have different levels of starch, which is the sugar. The cytoplasm solute concentration found in sweet potato cells and Yukon gold potato cells differ because sweet potatoes have more starch. As noted by Larsen, an expert on potatoes, “Medium starch potatoes include Yukon Gold and Yellow Finn potatoes” (Larson, 2018). The sweet potatoes are naturally sweeter because of the beta-carotene and potassium they already contain. When exposed to any solution that have higher concentrations, the water in the starchy potatoes are able to exit the cell and dilute the solution. Yukon Gold potatoes are categorized as medium starch potatoes. For each serving of 100 grams, there are 2.0 grams of sugar. As for sweet potatoes, each serving of 100 grams contains 4.1 grams of sugar (Nutritional Information) . III. Hypotheses 1. My first hypothesis is that the greater the difference in sugar concentration of the solvent and the sucrose concentration of the potatoes, the greater the activity of osmosis, and therefore the greater the change in mass. The lower the difference in sugar concentration between the solutions and the potatoes, the smaller the activity of osmosis, and therefore
Image of page 1

Subscribe to view the full document.

the smaller the change in mass. The justification for my hypothesis is from the concept of osmosis, where water molecules move through a semipermeable membrane in order to create equilibrium. The greater the difference in concentrations, the more the water
Image of page 2
Image of page 3
  • Winter '18
  • Stacey Skinner
  • Diffusion, Potato, Potatoes Lab

{[ snackBarMessage ]}

Get FREE access by uploading your study materials

Upload your study materials now and get free access to over 25 million documents.

Upload now for FREE access Or pay now for instant access
Christopher Reinemann
"Before using Course Hero my grade was at 78%. By the end of the semester my grade was at 90%. I could not have done it without all the class material I found."
— Christopher R., University of Rhode Island '15, Course Hero Intern

Ask a question for free

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern