Preview

Osmosis And Diffusion Lab

Good Essays
Open Document
Open Document
697 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Osmosis And Diffusion Lab
Osmosis and Diffusion

Title: Diffusion and Osmosis AP Lab 1

Purpose: The purpose of this activity is to determine the effects of a selectively permeable membrane on diffusion and osmosis between two solutions separated by a membrane.
Hypothesis:
Procedures: In lab manual
Material: In lab manual
Background Information:
Data:

Table 1
Diffusion of glucose and iodine.

| Color | Glucose | Time | Dialysis Bag | Beaker | Dialysis Bag | Beaker | Start | | | | | 30 minutes | | | | |

Table 2
Osmosis Investigation – Water gain by dialysis bags

Solution | Dialysis BagInitial Mass (g) | Dialysis BagFinal Mass (g) | Change in Mass (g) | % Change in Mass | Water | | | | | 0.2 M | | | | | 0.4 M | |
…show more content…
In part B, what caused the mass of the dialysis bags to change? Was there more or less water in the dialysis bags at the conclusion of the experiment? Explain.
5. Was the distilled water in the beakers hypertonic or hypotonic in relation to the sucrose solutions found in the dialysis bags?
6. Suppose the dialysis bags were placed in beakers containing a 0.6 M sucrose solution as opposed to distilled water. How do you think your results would change? Sketch a graph below to show how the mass of each of the bags would be affected.
7. Study the graph you have plotted for part C of the experiment. What is important about the point where the best fit line crosses the X-axis? What is the concentration of sucrose in your potato?
8. Fill in the blanks in the statement below using the following list:
Net gain, low, hypertonic, exit, osmotic, enter, less, hypotonic, high, more, net loss, isotonic (not all words are used) If a cell is placed in a ________ solution, it has _____________ solute in solution than the surrounding fluid, and will therefore experience a __________ of water to its surroundings. This cell has ______________ water potential since there is a great deal of _______ pressure causing water to leave the cell. Conversely, a cell sitting in a _______ solution has a ______ water potential, and since it will experience a ________ of water, there will be little osmotic pressure causing water to _________ the

You May Also Find These Documents Helpful

  • Better Essays

    Lab 5: Osmosis

    • 1044 Words
    • 5 Pages

    Hypothesis: If we add higher concentrations of sugar to the dialysis tubing, then the net movement of coffee into the dialysis tubing will increase.…

    • 1044 Words
    • 5 Pages
    Better Essays
  • Satisfactory Essays

    Bag #1 increased the most in size because the solution inside was of a higher concentration of sucrose than that of Beaker #2 so therefore the solution of Bag #1 was hypotonic and water moved into the bag from the solution of the beaker at the greatest rate because it had the highest difference.…

    • 306 Words
    • 2 Pages
    Satisfactory Essays
  • Better Essays

    Biolab 1208 Lab Report

    • 840 Words
    • 4 Pages

    Introduction: The biological membranes are composed of phospholipid bilayers, each phospholipid with hydrophilic heads and hydrophobic tails, and proteins. This arrangement of the proteins and lipids produces a selectively permeable membrane. Many kinds of molecules surround or are contained within cells, but water is perhaps the single most important molecule in any living system (Hayden and McNeil 2012). Since water molecules are so small, they are constantly going into and out of the cell. Osmosis is a situation where more water molecules are moving across the membrane in one direction than the other (Hayden and McNeil 2012). During osmosis the net movement of water molecules will be from a solution that has a lower osmotic concentration to a solution that has a higher osmotic concentration. When a solution has a higher concentration of solute within the cell than out, it is called hypertonic. When a solution has a lower concentration of solute within the cell than out, it is called hypotonic. And when there are equal concentrations inside and out of the cell, it is called isotonic. The relative osmotic concentration can be determined by a change in mass of the tissue.…

    • 840 Words
    • 4 Pages
    Better Essays
  • Powerful Essays

    bigg bio lab 2

    • 1093 Words
    • 8 Pages

    If a dialysis bag contains a 0.2 M solution of sucrose is placed in a beaker of distilled water, will the dialysis bag gain or lose mass? Explain why.…

    • 1093 Words
    • 8 Pages
    Powerful Essays
  • Good Essays

    9. Osmotic pressure, or osmosis, pushes water molecules __toward____ the area of greater solute concentration.…

    • 768 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    PhysioEx Exercise 1

    • 435 Words
    • 2 Pages

    Exercise 1: Cell Transport Mechanisms and Permeability: Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report…

    • 435 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Cells must move materials through membranes in order to maintain homeostasis. The cellular environment is aqueous, indicating that the solutes dissolve in the solvent, water. When a cell is hypertonic, or hypotonic, to its surroundings, it tries to make concentration of solution inside and outside itself equal. However, the solutes are too big to pass the cell membranes without the help of channel proteins, or transport proteins. Water may freely pass through the membrane by osmosis, which requires no energy. Thus, the cell starts to take in, or release, water until it is isotionic to its…

    • 468 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Ap Bio Lab One

    • 432 Words
    • 2 Pages

    Investigate the relationship between solute concentration and water movement by filling six different dialysis bags with increasing concentrations of sucrose and placing the bags into distilled water. After the time for the experiment has elapsed, compare the initial weight of each bag with its final weight, calculate the percent change in mass, and compare data with rest of class.…

    • 432 Words
    • 2 Pages
    Good Essays
  • Better Essays

    Lab Report Osmosis

    • 1689 Words
    • 7 Pages

    The main purpose of this paper is to assess the rate of change with osmosis for different concentrations of sucrose in artificial cells. Since the human body is composed of trillions of cells that contain roughly 85% of water, makes osmosis a very important concept (Carmichael, Grabe and Wenger). The forces that affect osmosis are the concentrations of solutes surrounding the cell or inside of the cell. Water will then move across the cell membrane and create a balance of water between the cell and its environment (Reece et al. 133). In order to calculate the average rate of change for our artificial cells, we must understand tonicity as the ability of a nearby solution to cause a cell to lose or gain water, depending on its concentration of non-penetrating solutes relative to solutes inside the cell (Reece et al. 133). The dialysis bags used in this experiment have membranes which are selectively permeable, which only allows particles specifically small enough to pass through (Carmichael, Grabe and Wenger). In a hypotonic solution, water…

    • 1689 Words
    • 7 Pages
    Better Essays
  • Good Essays

    The water in the test tubes surrounding the dialysis tubings was tested with standard food test reagents at the beginning of the experiment and again after one hour. The results showed that neither starch nor reducing sugar was present in the water surrounding tubes A and B at the beginning of the experiment. (7 marks)…

    • 1259 Words
    • 6 Pages
    Good Essays
  • Better Essays

    Abstract: In the content of the Module 2 we learned about Diffusion across cell membranes. We touched on the different types of cells and their functions. How things are transported in and out of cells. Learning about isotonic, hypertonic and even hypotonic solution. This is not my first time touching on this subject in my nursing career and I learned a way to remember what happens in the different solutions. This project was to see which solution was able to pass through the semi permeable membrane. I came to the conclusion that as we learned in this module some molecules are too large to pass through membranes and some are some are small enough to pass…

    • 1249 Words
    • 5 Pages
    Better Essays
  • Good Essays

    3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction?…

    • 1043 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    Membrane Permeability

    • 293 Words
    • 2 Pages

    A sodium sulfate solution was poured into the culture dish until the dialysis bag was fully submerged.…

    • 293 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Lab 1 Review Sheet

    • 1082 Words
    • 3 Pages

    3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction?…

    • 1082 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    After the dialysis tubing soaked in the distilled water overnight, the measurements showed that the dialysis tubing increased in mass. The initial weight of the dialysis tubing was 19.08 grams, but it went up to 19.34 grams after sitting in the distilled water for some time. The amount of distilled water in the beaker also decreased. There used to be 200 mL of distilled water in the beaker, but it decreased to 199 mL after the dialysis tubing soaked in it. The data collected supports the claim that water moves into the dialysis tubing to try to even out the concentration. In this experiment, the dialysis tubing is used in place of a red blood cell. In this case then, the data collected supports the claim that red blood cells appear bigger because…

    • 385 Words
    • 2 Pages
    Good Essays