Preview

Osmosis lab

Good Essays
Open Document
Open Document
1653 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Osmosis lab
The Measurement of the Rate of Osmosis by using “Deshelled” Chicken Eggs
(Effect of Solute Concentration upon Rate/Degree of Osmosis in Chicken Eggs)
Introduction
Every cell needs a mechanism that it uses in the maintenance of a constant internal environment. This is important in the control of the ever changing external environment to the cell. The transfer of materials to and from the cell thus needs a very stable mechanism to achieve this status. Cells are therefore bound a membrane that acts the selective controller of the movement of different substances to and from the cell. This is especially when dealing with the solutes both to and from the cell. Some solutes must be allowed to move into and out of the cell depending on the need and urgency of the very solutes. This membrane is considered to selectively permeable to different solutes and thus will only allow the passage of specific solutes to and from the cell. This implies that the membrane to most cells is selectively permeable or has a differential permeability to different solutes. Both the internal and the external environment to the cell are composed an aqueous solution that is made of dissolved organic and inorganic substances. The gradual or spontaneous movement of these substances in and out the cell are guided by a mechanism called diffusion. This is a movement by molecules to a region of lower concentration from that of higher concentration. A good number of studies have been used in the biology field that are related to the use and importance of such passive movements in the cells and the entire organisms. There exist a number of passive movements that are vital to the functioning of several organisms. These include movements like diffusion, osmosis and others. However, the paper will be pegged onto the factors related to osmosis. The experiment will try to underscore the importance of osmosis using the shelled eggs cells. This will also encompass the effects of several salt concentrations

You May Also Find These Documents Helpful

  • Good Essays

    Osmosis Lab Report

    • 491 Words
    • 2 Pages

    Osmosis Lab Report Hypothesis: Osmosis will occur when there is an uneven distribution of solute in a solvent. The higher the solute in solvent, then there will be a higher rate of osmosis through the diffusion gradient forming a hypertonic or hypotonic solution. Solvent with equal or no solute forms an isotonic solution.…

    • 491 Words
    • 2 Pages
    Good Essays
  • Powerful Essays

    Diffusion and Osmosis

    • 1370 Words
    • 6 Pages

    DIFFUSION AND OSMOSIS: WHAT’S TO EXPECT? Diffusion and osmosis are very important in biological process. Diffusion is the movement of molecules or ions from a region of their high concentration to a region of their low concentration. Osmosis is the diffusion of water molecules across a semipermeable membrane. To gain a better understanding of diffusion and osmosis, we examine multiple experiments to show diffusion and osmosis in animal cell, plant cell and synthetic cell. In our first experiment, we weight a decalcified chicken egg and place 10% NaCl concentration. At every fifteen minutes intervals, we weight the egg and record that the weight decreases. In our second experiment, we use three slices of aquatic plant Elodea and add pond water one leaf, distilled water for the second and 20% NaCl for the third, then observe the cells of each leaf with a compound microscope. Under microscope, chloroplasts (green organelles) in Elodea tend to bound to the cell wall in pond water, spread all over the cell in distilled water, pull away from cell wall in 20% NaCl. In our last experiment, we use a dialysis bag that contains 30% glucose and starch solution then place into a beaker of water and iodine solution. We then remove the bag out of the beaker, and use two test tube which label BAG, BEAKER to perform a Benedict’s test. We place solution in the bag in the BAG tube, and solution in the beaker in the BEAKER tube and add a drop of Benedict’s reagent to each tube, then heat each test tube and observe a color change in each tube. These experiments show that movement of water of chicken egg cell and Elodea cell is “osmosis” and movement of molecules in dialysis bag and beaker is “diffusion”.…

    • 1370 Words
    • 6 Pages
    Powerful Essays
  • Better Essays

    Osmosis Lab Report

    • 1606 Words
    • 7 Pages

    Introduction Diffusion and Osmosis are two concepts that go hand in hand with each other. Diffusion is simply described as the movement of a substance from a region of high concentration to a region of low concentration. In another words, the substance will move down its concentration gradient which is “the region along which the density of a chemical substance increases or decreases” (Campbell Biology pg. 132). If you understand the concept of diffusion then osmosis is a very simple process. It can be defined as the diffusion of water across a permeable membrane. Osmosis can be cellular or artificial, so even though we are creating artificial cells in this lab, it is still considered to be osmosis. During osmosis, a solvent is trying to get through a selectively permeable membrane to make the concentration of that solvent the same on both sides of the membrane. The rate of osmosis depends on the type of environment the cell is in. There are three different environments that a cell can find itself in, a hypertonic environment, a hypotonic environment, or an isotonic environment. The environment a cell is in will determine its tonicity which is “the ability of a surrounding solution to cause a cell to gain or lose…

    • 1606 Words
    • 7 Pages
    Better Essays
  • Good Essays

    Osmosis Lab

    • 566 Words
    • 3 Pages

    Introduction: In this experiment I aim to investigate the effect of the surface area to volume ratio on the rate evaporation of water in different sized containers. By measuring the time it takes for the whole amount of water to evaporate, a conclusion can be made about the validity of the surface to volume ratio in regards to the biological process of diffusion.…

    • 566 Words
    • 3 Pages
    Good Essays
  • Powerful Essays

    Osmosis Lab Report

    • 1235 Words
    • 5 Pages

    To what extent does varying the Sodium Chloride concentration impact the mass change of Solanum tuberosum cubes?…

    • 1235 Words
    • 5 Pages
    Powerful Essays
  • Good Essays

    Osmosis Case Study

    • 1449 Words
    • 6 Pages

    General Anatomy and Physiology Case Studies - Osmosis These two Case Studies come from a National Center on Case Studies. I think that a case study approach is very useful in applying knowledge and this is what makes you learn it better. They may be a little daunting when you read them but I will help you go through them. Please ask for help so this topic becomes more enjoyable for you.…

    • 1449 Words
    • 6 Pages
    Good Essays
  • Good Essays

    Diffusion is the molecular net movement from a higher concentration to a lower concentration. For instance, when a person is smoking, the smoke diffuses into the air. The molecules in the smoke, released from the cigarette, travel through the air. Here is how it occurs. When molecules are close enough, they collide with each other, their kinetic energy changes. Due to the direct relationship between diffusion and molecular kinetic energy, the molecules move away from the point of the collision as their kinetic energy is redirected. Therefore, molecules always tend to distribute themselves throughout the area they stay. It continues until dynamic equilibrium is reached, that is, no net movement happens. Molecules at that time are still in motion, but the amount of molecules moving in one direction equals to the amount of molecules moving in the other direction.…

    • 468 Words
    • 2 Pages
    Good Essays
  • Better Essays

    Lab 5: Osmosis

    • 1044 Words
    • 5 Pages

    Lab 5: Osmosis Purpose: The purpose of this lab is to familiarize you with osmosis and, specifically, what happens to cells when they are exposed to solutions of differing tonicities.…

    • 1044 Words
    • 5 Pages
    Better Essays
  • Good Essays

    Ap Bio Lab One

    • 432 Words
    • 2 Pages

    Introduction: This lab helps further our understanding of essential principles behind diffusion and osmosis. Permeability, concentration gradients, plasmolysis, water potential, and equilibrium were also concepts that were delved into in this lab. Understanding how diffusion and osmosis works is essential to understanding biology. Each time a cell has something move into or out of it, some sort of principle studied in this lab is occurring. Diffusion, osmosis, and passive and active transport are all fundamental concepts of Biology. This lab simulated osmosis in the cell. In this case, we used dialysis tubing to simulate the semi-permeable membrane of an animal cell.…

    • 432 Words
    • 2 Pages
    Good Essays
  • Better Essays

    Lab Report Osmosis

    • 1689 Words
    • 7 Pages

    Grand Valley State University 1 Campus Drive Allendale, MI 49401 mcraeal@mail.gvsu.edu Abstract In this study, we tested the validity of osmosis in artificial animal cells. Osmosis is the diffusion of free water across a membrane. The purpose of the study was to calculate the rate of osmosis in artificial cells containing different concentrations of sucrose and water. We studied the rate of osmosis in artificial cells by creating five different dialysis bags with different concentrations of both sucrose and water and calculating the cumulative change in weight ever 10 minutes for 90 minutes. Our results for the artificial cells showed different concentrations moved from high to low concentrations- through hypotonic movement or hypertonic movement.…

    • 1689 Words
    • 7 Pages
    Better Essays
  • Powerful Essays

    Osmosis Experiment Dennis M. Feliciano Grand Canyon University BIO100L Biology Concepts Lab June 25, 2011…

    • 1626 Words
    • 7 Pages
    Powerful Essays
  • Better Essays

    Diffusion and Osmosis Lab

    • 2132 Words
    • 9 Pages

    Diffusion and Osmosis Experiment Methods/Materials: 7.1 Experiment: Rate of Diffusion of Solutes In the initial set up of this experiment I had 2 sets of 3 screw-cap test tubes that had each been half-filled with 5% gelatin and 1-mL of the correct dye (either potassium dichromate, aniline blue, or Janus green) in each of the test tubes. I labeled the 3 test tubes of set 1 with which die they contained and marked them “5 ˚C”. Then with the other set I did the same exact thing, except I labeled these test tubes “Room Temperature”. I then placed set 1 of the test tubes in a 5˚ C refrigerator, while I kept set 2 at room temperature for a certain amount of time. I made sure to record the time I began the experiment in my lab manual. To begin, I removed set 1 from the refrigerator and compared the distance the dye had diffused in each of the 3 test tubes with the corresponding test tubes of set 2 that had been kept at room temperature. Next, I held each tube vertically in front of a white sheet of paper, and then used a metric meter to measure how far the dye had diffused from the gelatin’s surface (in millimeters). I then recorded each of these distances in my lab manual. I repeated this step for each of the test tubes in both set 1 and set 2 and recorded my results. Then, using my results, I calculated the rate of diffusion for each dye by using this formula: rate of diffusion = distance/ elapsed time (hours). Each of these calculations was then also recorded in my lab manual. I made sure I noted the time the experiment started, ended, and the total elapsed time in hours in my lab manual as well.…

    • 2132 Words
    • 9 Pages
    Better Essays
  • Better Essays

    The purpose of this lab was to observe the rate of osmosis and diffusion, as well as the effect of molecular size of the particles on this rate. Part I of the lab was a demonstration of osmosis and diffusion, that dealt with raisins in different liquid environments, each with a different concentration of sugar. Part IV of the lab was using the same idea as the demonstration, by putting objects in different concentrations of a substance; in this case elodea leaves in salt water. In both cases, the objects in a greater concentration of the substance were stripped of their water. However, where there was a little or no concentration of sugar or salt, the objects did not lose their water, and in the case of the raisin, became saturated with excess…

    • 2315 Words
    • 10 Pages
    Better Essays
  • Good Essays

    One purpose of the experiment was to gain an understanding of diffusion and osmosis, specifically in context of a plant or animal cell reaction to an isotonic, hypotonic, or hypertonic solution. Another objective was to understand the nuances of simple diffusion, facilitated diffusion, and active transport and to explicate the characteristics affecting the rates of diffusion. The next objective was to be able to explicate the partition coefficient and its influence on hemolysis. The final objective was to properly use a pipette (Spilios, 2015).…

    • 937 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Kymberly Swope Biology 1224-Introduction to Biology for Majors Abstract Ann, April, Kymberly and Rebecca ran tests on decalcified eggs using different solutions to discover how water and other liquids enter and leave cells. The experiment consisted of soaking the eggs in varying solutions for five minutes, then draining them; recording their weight before and after each interval. The ladies hypothesized that if the eggs lost weight after being submerged, then the solution used to submerge the egg was hypertonic. If the egg gained weight, then the solution was hypotonic. If, by chance, the weight remained unchanged, then the solution would be isotonic. The…

    • 551 Words
    • 3 Pages
    Good Essays