Observing Osmosis

Good Essays
Observing Osmosis
INTRODUCTION
Osmosis is the “diffusion of water across a selectively permeable membrane” (Raven et al. G-16). In this experiment, dialysis tubing was used to mimic the selectively permeable membrane to show what osmosis does when placed in different solutes. We filled dialysis tubes fill with different percentages of solute and placed them in beakers full of a different solute. Through this experiment, I saw what happens when the solution becomes hypertonic, hypotonic, and isotonic. My hypothesis was that bag A would shrink because the water would leave the bag to go to the higher concentration. Bag B would stay the same because it would be isotonic. Bag C and D would swell because water would rush into the cell where
…show more content…
The weight of the tube increased from 12.3 grams to 13.0 grams in 15 minutes; however, in the next 30 minutes, it decreased from 13.0 grams to 12.5 grams. The bag could have been weighed inaccurately before the weigh in by having water on the tube, or the scale itself, or the scale itself could have been misread. Since the bag was full of 10% sucrose and put in a beaker filled with 1% sucrose; the water should have rushed into the tube where the higher concentration was making the tube swell. The results of bag D supported my hypothesis that the water would rush into the tube where the higher concentration was; therefore, the tube would be hypotonic, and the tube would swell. This experiment showed the important of osmosis by showing how the tube that represents the cells in side us react when placed in different situations. This is very important to know in the medical field, when deciding how to keep our cells healthy and alive. Like when a person is being treated for dehydration, the doctors know what percentage of saline to put in us that it will not swell and eventually burst our cells. By watching osmosis make a cell hypertonic, hypotonic, or isotonic, we have a deeper understanding on why this subject is so important for our overall health and much

Related Documents

  • Decent Essays

    Importance Of Osmosis

    • 1161 Words
    • 5 Pages

    The weight change of the dialysis tubing decreased as the concentration of the sugar water in the dialysis tubing increased. The main mechanism in the experiment is osmosis. In each of the experiments, the solutions traveled from low concentrations of sugar solution to high concentrations to make the solute concentrations on the two sides of the semi-permeable membrane equal. For the control experiment (Tap/Tap) the mean weight change was approximately 1.88g. According to the hypothesis, this number should have been closer to zero, but there could have been other factors that contributed to this number.…

    • 1161 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    The tonicity or internal tension of a cell is heavily affected by osmosis. If a cell is placed in a solution with more solute than inside of the cell, the solution is said to be hypertonic and the cell shrinks. However, if a cell is placed in a solution with less solute than the cell, water will rush into the cell causing it to swell. When the solute concentration is almost equal this is referred to as an isotonic solution. These principles have many practical applications in everyday life.…

    • 2098 Words
    • 9 Pages
    Decent Essays
  • Decent Essays

    Osmosis In The Human Body

    • 805 Words
    • 4 Pages

    The muscular relax and let urine out of the body through the urethra (Homeostasis 2013). Minerals and salts found in water are transferred through osmosis. Water flows from the plasma membrane of cells. Because of the osmosis concentration of water, glucose, salt, and other materials are maintained inside the body resulting in osmotic filtration which is imperative in preventing cell damage. Another example of osmosis would be kidney dialysis.…

    • 805 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    Alka Seltzer Experiment

    • 1056 Words
    • 5 Pages

    surface area vs rate of time Introduction: In the investigation an experiment is conducted investigate if the breaking of alka seltzer into ½, ¼ and none effect the time it dissolves. The context of the problem is the time it dissolves to have the medicine show its effect. This problem exist in real life as people take alka seltzer to relief heartburn, acid digestion and stomach aches. This experiment would benefit society because it informs the society the better way of consuming medicine or alka seltzer in order to see faster effect in the body. Aim: To investigate the breaking of the alka seltzer into larger surface area (½ and ¼) affects the time it dissolves.…

    • 1056 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    Tetrahymena Experiment

    • 1363 Words
    • 6 Pages

    The rate of how fast and slow contractile vacuole contracts in the Tetrahymena depends on what osmosis pressure it is in. The tetrahymena fills up with water and then contracts right before it bursts. Osmosis occurred in this experiment which affected the rate at which contractile vacuole contracts in the Tetrahymena. In a hypertonic solution, such as 500mM NaCI, water is already leaving the cell due to osmosis, a type of diffusion of water going from a high concentration to a low concentration or concentration gradient. Since the water is already leaving the cell, the contractile vacuole in the Tetrahymena does not need to work as hard to get water out of it.…

    • 1363 Words
    • 6 Pages
    Decent Essays
  • Decent Essays

    Essay On Osmosis

    • 664 Words
    • 3 Pages

    Because there is more solute and less water outside the cell, water will naturally diffuse from the cell to the environment to create equilibrium between the two solutions. In this way if the environment has an even higher alcohol concentration more water will move from the cell to its environment and when the water moves out the cell’s size will decrease. Due to certain circumstances, we were unable to discuss with other groups and their arguments, but it can be inferred that because their investigations were similar to ours that their arguments and claim are similar to…

    • 664 Words
    • 3 Pages
    Decent Essays
  • Decent Essays

    Diffusion And Osmosis

    • 822 Words
    • 4 Pages

    The water moves out of the cell in order to dilute the solution making it less concentrated. In this experiment ,my group members and I used 0.04 M of a starch solution, Dialysis tubing , graduated pipettes , rubber band/dialysis clip, 250-ml beakers, Iodine, conductivity probe,and a computer with loggerpro software. Before starting to gather supplies one of my group members logged into the computer and pulled up the loggerpro software. Another group member opened the drawer at the table and set up the conductivity sensor, so it could work properly with the loggerpro program. Next, we Obtained two , large graduated cylinders.…

    • 822 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    This value is comparable to the CRC Ksp, which is 5.02×〖10〗^(-6). Our calculated value is slightly larger than the literature value because of our experimental error. Some of this error came from the different methods that we chose to separate the solid calcium from the hydroxide solution. The three methods that we used were decanting, separation by centrifuge, and filtration with filter paper. According to the CRC Handbook, the expected concentration at 20 degrees Celsius of dissolved calcium hydroxide is 2.025×〖10〗^(-2)M. During our experiment we found that filtration yielded the most accurate results, followed by separation by centrifuge, and then by decanting.…

    • 840 Words
    • 4 Pages
    Decent Essays
  • Decent Essays

    Starch Osmosis Experiment

    • 1042 Words
    • 5 Pages

    The difference between the variable in the control and the experimental is the variable that is being tested. In this experiment the Variables Control Group Experimental Group Iodine Time Amount of Iodine Starch Solution Starch solution Temperature of water Temperature of water Dialysis tubing Dialysis tubing Beaker Beaker Water water Time Table 1: This is the table showing the experimental design. The following is a set of step-by-step instructions for this experiment. 1. Cut 1 piece of dialysis tubing approximately 15 cm long.…

    • 1042 Words
    • 5 Pages
    Decent Essays
  • Decent Essays

    Purpose of this lab is to find out how rate of reactions are affected by volume affects and determine which chemical affects the solution rate of reaction. Temperature was also a factor in discovering how it will affect the speed of the reaction. This was done by gathering certain chemicals and mixing them into a test tube then recording how long it took to change color. Temperature was tested by placing the test tube in ice water over a hot plate and slowlying increasing the temperature. Sodium thiosulfate slows the rate of reaction when increased and KI increases the rate of reaction when increased.…

    • 1495 Words
    • 6 Pages
    Decent Essays