• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15

What effect does the sucrose concentration have on osmosis?

Extracts from this document...


Osmosis Coursework: What effect does the sucrose concentration have on osmosis? Aim of Investigation: Investigating osmosis in potato chips in relation to the concentration of the solution that the chips are tested in. What is osmosis? Osmosis is the net movement of a liquid across a selectively permeable membrane from a solution/area of a high concentration to a solution with a lower concentration. Osmosis is a type of diffusion that involves a liquid (usually water) rather than other state's (solid or gas) of molecules. So in full, Osmosis is the diffusion of a solvent through a semi-permeable membrane from a dilute to a more concentrated solution. What is sucrose? Sucrose is sugar which is found as a disaccharide naturally in many plants. It is used for production of sugar. Formula of Sucrose: C12H22O11 What is a disaccharide? A disaccharide is a sugar consisting of two linked monosaccharide units. What is a monosaccharide? A monosaccharide is a simple sugar such as glucose or fructose that cannot be broken down into simpler sugars. The effect of sucrose concentration on water and osmosis Water always travels from a high concentration to a low concentration. Due to this fact, when there is a high concentration of sucrose in water, the water particles will diffuse into the sucrose - as sucrose has a high concentration of sugar and a low concentration of water. The effect of water movement on the cell Plant cells always have a strong cell wall surrounding them. When they take up water by osmosis they start to swell, but the cell wall prevents them from bursting. Plant cells become turgid when they are put in dilute solutions. Turgid means swollen and hard. The pressure inside the cell rises; eventually the internal pressure of the cell is so high that no more water can enter the cell. This liquid or hydrostatic pressure works against osmosis. ...read more.


Furthermore, I will repeat the experiment three times and take the average measurement in an attempt to get the most reliable and accurate results possible. Moreover, I rolled the potato in a tissue before weighing after it had been taken from the test tubes. Preliminary Studies As part of my preliminary studies I undertook one experiment of each concentration. I am to try and conclude: 1. If the length 4cm by 1cm by 1cm is good enough. 2. If I will keep the concentrations as they are. 3. If the method should remain the same. Concentration Before mass (g) After mass (g) Difference in mass (g) % difference in mass (2d.p) 2M (20ml of Sucrose) 2.95 1.61 -1.34 -45.42% 1.5M (15ml of Sucrose and 5 ml of Distilled water) 2.76 1.56 -1.2 -43.47% 1M (10ml of Sucrose and 10ml of distilled water) 2.88 1.93 -0.95 -32.98% 0.5M (5ml of Sucrose and 15ml of Distilled Water) 2.91 2.87 -0.04 -1.37% 0M (20ml of Distilled Water) 3.04 3.39 +0.35 +11.51% Implications of Preliminary Studies 1. If the length 4cm by 1cm by 1cm is good enough. 4cm took a long time to cut and the length was quite long - the top of the potato was barely contained in the 20 cm3 solution. From the preliminary I can see that using 4cm would be a mistake. Instead I am going to use 3cm. Each potato will be cut 3cm by 1cm by 1cm and then put in the solution. 2. If I will keep the concentrations as they are. I think that the concentrations used are fine and the results they gave me are comparable and reliable. Making each of the solutions was remarkably easy - as I had all the resources at my hands. 3. If the method should remain the same. I think that the method used was efficient and easy. It was extremely easy to repeat and since I have carried it out so many times I have gotten used to it. ...read more.


This problem could easily be solved if a cork boror is used to cut the potato. To increase accuracy, the experiment could have been carried out even more times. I could also have tested a larger range of concentrations to expand my investigation. Furthermore I could have measured the mass in intervals rather than after 24 hours e.g. every 2 hours and I could have also let the investigation run longer than 24 hours - this way I could possibly find the saturation point. Moreover I could have weighed the potatoes on a more accurate scale e.g. not to 0.00g but to 0.0000g. To further research the field of osmosis I could conduct other investigations exposing the same weight pieces but different surface areas. This way I can see how the surface area of a potato affects the amount of osmosis that takes place. I could use the results obtained from this experiment to compare the differences and similarities of the end results of both investigations. I could also use a larger variety of concentrations; this would make the estimation of concentrations in between those tested in this investigation much more accurate. Another way of investigating osmosis further would be by seeing the effect of concentration on different types of potatoes e.g. red or baked etc. or using entirely different plants (e.g. plants, other vegetables, fruits or a different type of potato). This would test how different semi-permeable membranes could affect osmosis and the movement of water out and into organisms. I could also conduct an investigation into how osmosis is affected when it occurs it different conditions, i.e. how osmosis occurs under a high or low temperature. I could also further investigate this field by seeing how much heat a semi-permeable membrane can withstand before it disrupts. Moreover, I could then do another investigation to see how exposing the potato to heat beforehand affects osmosis. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    An investigation into the effect of a germination inhibitor on the germination of seeds.

    3 star(s)

    would allow the seeds to germinate, because a high temperature should speed up the reaction but the inhibitor should slow it down. If the experiment noted the results for longer than 6 days then perhaps the seeds in the higher concentrations would germinate as well because the inhibitor may have just induced dormancy for a few days.

  2. Peer reviewed

    Osmosis in potato and apple

    3 star(s)

    "Osmosis is the net movement of water molecules from a region of high water potential to a region of lower water potential". At 0M concentration: In distilled water I believe that the apple will gain in mass and length significantly turgid.

  1. Determine the water potential of potato tuber cell with the varying affect of solute ...

    This literally means that the solute molecules have taken up all the space in the total solution and that now there is very little water left in the solution. This means that the concentration of the water molecules is much less than that of the inside of the cell.

  2. The effect that different concentrations of salt solution in the water has on strips ...

    So overall the method that should be employed: Small Size borer used (preferably size 2), Glass test tubes with airtight cork to be used, Mass of each potato strip to be recorded, Length of each Potato strip kept constant each time.

  1. Free essay

    Investigation osmosis in potato cells

    Weighing machine To weigh the potato before and after the investigation to see if osmosis has changed it. Ruler To find the length before and after the investigation to see if osmosis has changed it. Scalpel To cut the ends of the potato leaving only the part you want and the cylinder to the length wanted.

  2. To investigate the effects of using different concentration of Sucrose solutions in Osmosis with ...

    * When the solution is very weak (i.e. not much Sucrose) then the cucumber might still gain mass depending on how high the concentration is inside the cucumber. * As the concentration increases, the loss of water from the cells will increase. This will be shown by a change in mass.

  1. Osmosis, I predict the mass of potato will first increase then start decreasing as ...

    a knife and cut it to the length needed on a tile. Then I will measure the mass of all of them using a scale and record it. 2) Next I will have six different test tubes with 20 cm� of different concentrations of salt (sodium chloride)

  2. Osmosis investigation. My prediction is that as the concentration of the solute increases, ...

    I believe this because of particle theory- that the solution with the highest concentration of water molecules will diffuse through the partially permeable membrane faster than the other side due to the greater amount of water molecules colliding with the membrane; this applies to my prediction- as the lowest concentration

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work