How does the concentration of sucrose affect the weight of pieces of potato after osmosis has taken place? Aim The aim of this is experiment is to investigate how much sucrose is in a potato. We are going to investigate the effect of different concentrations of sucrose on the weights of pieces of potato after osmosis has taken place. Prediction I predict that the less concentrated the solution of sucrose is, the greater the weight of the potato will be. 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 purpose of this experiment is to investigate the effect of changing the concentration of sodium chloride solution on the rate of osmosis in tubes of potatoes. This was maintained using equal measurements of the potato tubes and applying them into the different concentrations of sodium chloride, 0%, 2%, 5%, 10%, 20% and 26%, in beakers then measuring the change in mass of the potato tubes afterwards. The time taken for all potato tubes to be placed in solution was 15 minutes. Can the concentration gradient of the sodium chloride solution influence on the rate of osmotic diffusion undergone by the potato tubes? Osmosis is a type of diffusion which is only applied on water and is a passive process which does not require an input of energy from the cell; this is because materials are moving with the concentration gradient.
Investigating the Effect of Different Concentrations of Sucrose Solutions on Potato Tiessue Planning For my GCSE biology coursework, I am going to conduct an investigation into the effect of different concentrations of sucrose solutions on potato tissue. Text Box: A measuring cylinder Apparatus =========================================== 18 test tubes [IMAGE][IMAGE] Text Box: 1M sucrose solution [IMAGE]A test tube rack [IMAGE] Cork borer Text Box: Distilled water[IMAGE] [IMAGE] A potato Text Box: White tile [IMAGE] [IMAGE] Balance Text Box: Scalpel[IMAGE] [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] Prediction ========== As the concentration of the sucrose solution increases, the mass of the potato cylinders will decrease. This is because osmosis is taking place. Osmosis is the diffusion of water from a higher concentration of water to a lower concentration of water through a selectively permeable membrane. When the potato in is put into distilled water, it will get bigger as water will enter its cells by osmosis.
The effect of osmosis in potato cells with different concentrations of sucrose solution Aim: To test the effect of different concentrations of sucrose solution to osmosis in a potato cells by putting potato pieces in test tubes of water containing different concentrations of sucrose solution. Scientific Theory: Osmosis is defined as the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. In a high concentration of water the amount of solute (e.g. sugar) is low. This could be called a weak or dilute solution.
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. Osmosis is "the movement of a solvent through a selectively permeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane" Osmosis is the movement of water from high water concentration to lower water concentration through a selectively permeable membrane. Selectively permeable membranesare very thin layers of material (cell membranes are selectively-permeable), which allow some molecules to pass through them but prevent other molecules from passing through. Cell membranes will allow small molecules like Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through.
Water moves across the membrane from a weak solution (high concentration of water molecules) to a stronger solution (lower concentration of water molecules). In this case, the two solutions are the cytoplasm inside the potato cells and the sucrose solution that I am placing my potato chip in. The partially permeable membrane is the cell membrane of the potato cells. When potato chips are placed in pure water, the concentration of water molecules surrounding the plant is higher than the concentration of water molecules inside the cytoplasm of the potato's cells. The water will diffuse into the cell and the cytoplasm by osmosis.
Finding the Relationship Between Turgidity of Potato Cells and the Concentration of the Surrounding Medium Planning Aim: To find the relationship between turgidity of potato cells and the concentration of the surrounding medium. Prediction: I predict that when the potato chip is put into the solutions, water will pass from the weaker solution into the stronger solution. For example, when a potato chip is put into distilled water, the water will pass from the distilled water into the potato cells, making it more turgid because the cells now have more water in them. When a potato chip is put into 1M sugar solution, the water from the potato cells will pass into the sugar solution because the solution inside the potato cells is weaker than the solution in the test tube. This will cause the potato cells to lose water making the chip limp or flaccid.
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.
I will look at the rate of osmosis on the potato cylinders in different concentrations of salt solution. I will dilute the solutions using distilled water. Hypothesis I predict that when the potato tubes are in a higher concentration of the salt solution than the concentration of water, i.e. the solution is concentrated, then the potato tubes will lose mass and become smaller. This is because the concentration of water outside the potato cylinders is concentrated, and there is not much water.
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.