The higher the concentration of water in the external solution, the higher the amount of water that enters the cell by osmosis. The smaller the concentration of water in the external solution, the higher the amount of water that leaves the cell. However, there will be a point where the concentrations of water inside and outside the cells are equal. This is known as the isotonic point, and at this point there will be no change in the length, vo... ... middle of paper ... ...nger, this would have enabled me to find the saturation point (when the potato can no longer take in any more water) and dehydration point (when the potato cannot lose any more water)and therefore get a more accurate result. Finally, I could extend the experiment to a more exact level by looking at the potato cylinders under a microscope, and then I would be able to see the cells in greater detail and draw some more observational results.
2. To investigate the internal concentration of potato cells in terms of sucrose solution. Hypothesis For this investigation I think that the lower the concentration of the sugar solution in the test tube the larger the mass of the potato will be. This is because the water molecules pass from a high concentration, i.e. in the water itself, to allow concentration, i.e.
Effect of Concentration on Osmosis Aim To find out how the concentration of sucrose solution affects the mass of the potato chip left in the solution for one day. Prediction I predict that when the sucrose concentration is low the potato chip will gain mass. This is because there will be a higher sucrose concentration in the potato chip so water will go into the potato from the solution. I predict that when there is a high concentration of sucrose the potato will lose mass. This is because there is a higher concentration of sucrose solution in the solution compared to that in the potato chip so water from the potato will go into the solution to even it out.
I predict this because osmosis is the movement of water from a region of high water concentration to a region of low water concentration through a semi-permeable membrane i.e. the cell wall of the potato. If the concentration of water inside the potato is high then the water will pass out through the cell wall, decreasing the weight of the potato. If the concentration of water outside of the potato is high then the water from outside of the potato will pass through the cell wall into the potato, thus increasing the weight of the potato. A low concentration of sucrose will have a greater ratio of water to sucrose, so more water will pass thorough into the potato in an attempt to even up the amounts of water and sucrose on both sides.
I believe this because each Molarity of sucrose will change the potato's water content. This will happen because either the concentration will higher in the sucrose and lower in the Tubas or lower in the sucrose and higher in the Tubers. Therefore water will travel in or out of the potatoes cell though its partial permeable membrane. Preliminary Method Â· I will firstly get 10 test tubes and to test tube racks Â· Then I will cut 9 pieces of potato Â· I will then get 3 different Concentrations of sucrose solution and add 20cm3 to each test tube Â· Cut a 4 mm in diameter tuba to 1 cm in length Â· Now I will measure the length and mass Â· Now place the pieces in Â· Now leave this for 15 minutes Â· Now I will measure the length and mass Preliminary Results After we did the Preliminary Test we decided to use 1 cm long 4 mm diameter tubas. We would put them in 25 cm3 sucrose solutions.
If the potato is placed into a salt solution the concentration of water will be greater inside the cell than outside, osmosis will take place and the water will once again move from the area of high concentration (inside the cell) to the area of low concentration (outside the cell). This will cause the potato to lose weight as it loses its water. If the potato is placed in a mixed solution then the concentrations inside and outside of the cell should be equal, the water molecules will move by osmosis but the concentrations will remain equal. Apparatus: - 125ml of 1ml sodium chloride solution. - 125ml distilled water.
Osmosis Investigation Aim To find out what type of things affect the rate of osmosis in plants for example, temperature and time. I will do this using a piece of potato submerged in different amounts of sugar solution and record any changes in mass. Prediction ========== Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low concentration. Therefore I predict that the potato in the highest sugar solution will have the lowest water concentration and the weakest sugar solution will have the highest water concentration. This is due to the fact that in high sugar solutions the water leaves the cells due to osmosis making the potato lighter.
copybook.) Hypothesis- If the concentration of sucrose increases, then the mass of the potato will decrease. However, if the concentration of the solution in the beaker is less than that of the potato (such as distilled water), then the mass of the potato will increase. So, as the concentration of sucrose increases the rate of osmosis increases. Variables- Independent variable: the concentration of sucrose solution in which the potato will be placed: o Distilled water o 20% sucrose solution o 40% sucrose solution o 60% sucrose solution Dependent variable: the change in mass of the potato after the experiment by osmosis.
The Solute Concentration of a Potato To find out what the solute concentration of a potato is, this shall be done by finding out the effect of Osmosis on a potato. Prediction: That if there is more water outside the potato than inside, the potato will increase in size. If however there is less water outside the potato than within, then I shall expect the potato to shrink in size. I think this because of the laws of Osmosis. Osmosis is the diffusion of water through a partially permeable membrane from a high concentration gradient, to a low concentration gradient.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis. The potato tubes in higher concentration sugar solution will shrink because water leaves their cells due to osmosis.