An investigation of the glucose concentration of the cell sap in potato cells In this experiment I intend to investigate the effects of osmosis on potato cells. Specifically, I intend to use my knowledge of osmosis to investigate the glucose concentration of the cell sap in potato cells. Osmosis is a method by which water levels on either side of a semi permeable membrane may balance themselves. It occurs between regions of high water concentration and low water concentration. As it is a special method of diffusion exclusive to water, it also allows dilute and concentrated solutions to balance their strengths.
The transport of materials against a concentration gradient requires energy, so it is called active transport. Aim Our aim was to find out how sugar solution strength affects osmosis, we did this by doing an experiment and then got the results. The results are as expected the 2m solution has made the potato pieces in the jar shrink. The experiment has proven that the stronger the solution is the more it affects the rate of osmosis in a semi-permeable membrane. The aim that we had was proved right and sought out to investigate osmosis in a more detailed way for us to find out more information about it.
Osmosis will occur if a vessel is separated into two compartments by a semi permeable membrane, both compartments are filled to the same level with a solvent, and solute is added to one side. The level of the liquid on the side containing the solute will
Osmosis of Potato Chips Introduction For this coursework, I am planning to conduct a series of experiments which will hopefully show me how much percentage change in mass will happen in potato chips when osmosis is present. To find out the change we will have to choose a variable to change. We could change: Å¸ The length of the potato chips. Å¸ The weight of the potato chips. Å¸ The concentration of the sugar solution.
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.
Osmosis The cell membrane is partially permeable in that it allows some molecules to diffuse rapidly but slows the passing of others. The glucose molecules try to diffuse to the outside but cannot get through the membrane because the pores are too small. The water molecules diffuse trough the pores down the concentration gradient. This membrane- controlled diffusion of water molecuse is controlled by osmosis, it can works both ways so that it can pass into and out of the cell. Osmosis and Diffusion If water is withheld from a flowering plant, the flowers wilt.
In both of my investigation there were obviously some differences which were in the method, apparatus, results and means of measuring etc. Essential Background Reading Osmosis is the diffusion of water molecules across a partially permeable membrane from a high concentration of water to a low concentration of water. Movement of substances takes place through the cell membrane, which separates the different substances in the cell from its surroundings. This type of membrane allows small molecules such as water to pass through it, but it denies entry to large particles to pass. This membrane is called a partially permeable membrane.
Thus they are able to diffuse across the membranes of the tubule. Once inside, the pH of the tubule will ionize them and render then unable to pass across the cell membranes. The removal of xenobiotics is dependant on many factors. First is the polarity of the xenobiotic. Polar compounds are soluble in the plasma water are more easily removed by the kidneys through the use of glomerular filtration.
For example, cell membranes will allow small molecules such as Oxygen, water, Carbon Dioxide, Ammonia, Glucose, amino acids, etc. to pass through. But they will not allow larger molecules such as Sucrose, Starch, and protein, etc. to pass through. A region of high concentration of water is either a very dilute solution of, for example, sucrose, or Pure Water.
Investigation of Osmosis Aim: - To investigate the effect of varying the concentration of sugar solutions on the effect of osmosis between the solution and a potato chip cells. Apparatus: - Potatoes Watch Sugar solutions (DI, 0.2, 0.4, 0.6, 0.8, 1Molar) Distilled water Mass balance Knife Measuring cylinder 6 petri dishes Ruler Prediction: - I think that the lower the concentration of the sugar solution in the petri dish the larger the increase of the mass of the potato will be. This is because the water molecules pass from a high concentration to a low concentration of water molecules through a semi-permeable membrane. The chips in higher water concentrations will have a larger mass than in higher sugar concentrations. My graph may look like this: [IMAGE] I think this is going to happen because of the following scientific knowledge: Scientific Knowledge: - Osmosis is the movement of water molecules to a lower concentration of molecules through a semi-permeable membrane.