Osmosis experiment with potato and sugar solution

Osmosis experiment with potato and sugar solution


  • Effect of Salt Concentration on Osmosis in Potato Cells Lab Answers
  • Potato Lab Protocol
  • Osmosis Lab Example 2
  • Investigating Osmosis using Potato Strips
  • Answer to Question #158156 in Cell Biology for Chiara
  • Experiments on Osmosis (With Diagram)
  • Effect of Salt Concentration on Osmosis in Potato Cells Lab Answers

    Pssst… we can write an original essay just for you. Any subject. Any type of essay. Get your price writers online The aim of this experiment was to investigate how different concentration of sucrose effect on the rate of osmosis on cubes of potatoes This was done by using potato cubes cut out for the exactly same size 2 cm length 1cm width and 1cm height. And applying them into beakers filled with different concentration of sucrose solution.

    Then the mass of potato cubes needed to be recorded after. The amount of time were used to soak the potato cubes were 40 minutes. Hypothesis- Results were predicted that if the potato cubes were placed into sucrose concentration where the water potential is higher than the water potential of the potato itself than it would cause the mass of potato to increase and if they had similar water potential there will be no change in the mass , and lastly is the water potential of sucrose is less than the water potential of the potato means the mass of potato will decrease Background- Osmosis is the movement of water molecules.

    Water molecules move from a higher water potential to a lower water potential through a semi permeable membrane. There is few factors that affect the rate of osmosis including the size of particle and temperature however the factor That is investigated today is the concentration of the sucrose As the concentration of sucrose increases the mass of potato also increases because it has been placed in a hypertonic solution which means that it has a higher amount of particles dissolved in the solution.

    Variables-Independent variables — The concentration of Sucrose solution in which potato cubes were placed in. Risk assessment was filled out.

    Each cuboid was measured to be 2cm x 1cm x 1cm. Anymore waste was disposed The electric weighing scale was plugged in The weighing scale then was turned on The scale was set to grams Next the labeled filter paper was placed on the scale Scale was set to 0 again before a piece of potato were placed on it to measure the mass This was repeated 6x times for each cuboid Then all cuboids were placed in the sucrose , 1 cuboid in each beaker The cuboids were left to soak for 40 minutes The cuboids then were removed one by one and placed on the scale on a filter paper excess water to be shaken off the tear button MUST be pressed before placing the potato on the filter paper.

    The mass was recorded and this step was repeated 6x for each cuboid. The scale was unplugged and the plug was switched off for safety matters Observations The potato cuboids were floating in the 0. Conclusion The table of results above show the effect of osmotic activity inside the potato pieces by the water molecules moving throughout a semipermeable membrane which exists within the concentration gradient.

    The molecules move into an area of lower concentration which in this case is the sucrose solution because osmosis takes place from a high-water concentration to a low water concentration area. The more osmotic activity which took place resulted in the potato pieces decreasing their weight. The table shows that the pieces of potato which were placed in a 0. As stated in the hypothesis result was predicted that there would be a decrease in weight As the potato cell was surrounded by a more concentrated solution this resulted in there being a lower water concentration within the potato cell which meant osmosis took place making it hypertonic.

    As predicted, results were correct the potato pieces which were more water concentrated have weighed more compared to the other potato pieces which were placed in a more sucrose concentrated solution. Evaluation Overall the experiment went very well as there were no major mistakes were made during the experiment. The method which was used to conduct the experiment was very suitable. Furthermore, it was also a very good method to use because it helped to achieve reliable and accurate results in order to draw up an accurate conclusion.

    However, if the experiment could be repeated there would be couple of things that could be done differently. When carrying out the experiment a range of 0, 0.

    In the future more varied range of the concentration of the sucrose solution would be better in order to achieve a more varying range of results i. There was an abnormal result as shown on the results graph and table as the 1. This is may have been due to the fact that the potato piece had a little bit more water potential compared to each other potato piece therefore this resulted the potato to decrease in mass only a little bit i.

    As a result, in carrying out any future experiments each potato piece should be soaked the same amount of time and method. However, the potato pieces should have left in the solution for a longer length of time. Furthermore, repeating the test 3 times instead of 1 would also give a better and more accurate conclusion and results. Your time is important.

    Potato Lab Protocol

    The following results and conclusions were deduced by this experiment: Potatoes in water: An increase in mass of the potato strip due to the movement of water molecules into the plant cells via osmosis.

    The water is hypotonic. This means it possesses high water solution and is low on sugar. In contrast, the potato is hypertonic: it has low water potential and a high sugar solution. When put into contact, water will diffuse into the potato and hence expand its size, making the final size greater that its initial results.

    This is also relevant to the increase in length. Since the intake on water molecules occupies extra space, it also changes the volume of the potato by pushing against the cell membrane and the proximate cellulose cell wall.

    This results into an expansion in all dimensions, including length. However, the expansion is limited by the stiffness of the cellulose cell. Potatoes in Ribena: There is a decrease in the mass of the potato strips due to the movement of water molecules outside of the plant cells.

    Ribena is mainly a sugary solution and hence is hypertonic to the potato cells, which are hypotonic. The water molecules will move along their concentration gradient out of the cells and thus make the potato strip shrink. The decrease in the number of water molecules results in loss of volume and length. Potatoes in Mixture of both: There was a decrease in weight and length present but not as great as the one by Ribena. The solution still contained a higher sugar rate and is therefore hypertonic.

    However, the contrast between hypertonic and hypotonic is smaller and hence the result is less visible. In order to generalize and prove the statements mentioned above, the class compared its results and established the following realizations:.

    Osmosis Lab Example 2

    This results into an expansion in all dimensions, including length. However, the expansion is limited by the stiffness of the cellulose cell. Potatoes in Ribena: There is a decrease in the mass of the potato strips due to the movement of water molecules outside of the plant cells. Ribena is mainly a sugary solution and hence is hypertonic to the potato cells, which are hypotonic. The water molecules will move along their concentration gradient out of the cells and thus make the potato strip shrink.

    The greatest water potential is within the dialysis bag. Water will diffuse out of the bag because the highest water potential is inside the bag, forcing the water out. Calculate solute potential of the sucrose solution in which the mass of the zucchini cores does not change. Show work. Calculate the water potential of the solutes within the zucchini cores.

    Adding solute to a solution would increase the solute potential and decrease the water potential. Consider what would happen to a red blood cell placed in distilled water: Which would have the higher concentration of water molecules? The distilled water would have the higher concentration of water molecules. Which would have the higher water potential? The red blood cell would have the higher water potential. What would happen to the red blood cell?

    The red blood cell would take in a lot of water and might lyse due to pressure inside. This is a possibility because animal cells have no tolerance under hypotonic situations. Describe the appearance of the onion cells. The onion cells appear to have great turgor pressure, spread out, thick and bright in the inside.

    Investigating Osmosis using Potato Strips

    The cell walls were very defined and it was clear where one cell ended and another began. Describe the appearance of the onion cells after the NaCl was added. The plasma membrane shriveled from the cell wall, causing plasmolysis. The cells looked wrinkly or weak. The turgor pressure dropped tremendously. Remove the cover slip and flood the onion with fresh water.

    Observe and describe what happened. The onion cells were again hypertonic to their environment, and gathered water, increasing in turgor pressure and restoring themselves to the normal state of being. What is plasmolysis? Plasmolysis is the separation of the plasma membrane from the cell wall in a plant cell. Why did the onion cell plasmolyze? The environment became hypertonic to the cell and the water left the cell running with its concentration gradient due to the NaCl.

    With all the water leaving the cell, it shrank, leaving behind its cell wall. In the winter, grass often dies near roads that have been salted to remove ice. What causes this to happen. Hypothesis- Results were predicted that if the potato cubes were placed into sucrose concentration where the water potential is higher than the water potential of the potato itself than it would cause the mass of potato to increase and if they had similar water potential there will be no change in the massand lastly is the water potential of sucrose is less than the water potential of the potato means the mass of potato will decrease Background- Osmosis is the movement of water molecules.

    Answer to Question #158156 in Cell Biology for Chiara

    Water molecules move from a higher water potential to a lower water potential through a semi permeable membrane. There is few factors that affect the rate of osmosis including the size of particle and temperature however the factor That is investigated today is the concentration of the sucrose As the concentration of sucrose increases the mass of potato also increases because it has been placed in a hypertonic solution which means that it has a higher amount of particles dissolved in the solution.

    Variables-Independent variables — The concentration of Sucrose solution in which potato cubes were placed in. Risk assessment was filled out. Each cuboid was measured to be 2cm x 1cm x 1cm. Anymore waste was disposed The electric weighing scale was plugged in The weighing scale then was turned on The scale was set to grams Next the labeled filter paper was placed on the scale Scale was set to 0 again before a piece of potato were placed on it to measure the mass This was repeated 6x times for each cuboid Then all cuboids were placed in the sucrose1 cuboid in each beaker The cuboids were left to soak for 40 minutes The cuboids then were removed one by one and placed on the scale on a filter paper excess water to be shaken off the tear button MUST be pressed before placing the potato on the filter paper.

    The mass was recorded and this step was repeated 6x for each cuboid.

    Experiments on Osmosis (With Diagram)

    The scale was unplugged and the plug was switched off for safety matters Observations The potato cuboids were floating in the 0. Conclusion The table of results above show the effect of osmotic activity inside the potato pieces by the water molecules moving throughout a semipermeable membrane which exists within the concentration gradient. The molecules move into an area of lower concentration which in this case is the sucrose solution because osmosis takes place from a high-water concentration to a low water concentration area.


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