Examine the pores and look at a cell layer diagram. The experiment report, ib biology lab ia examples of potato osmosis. This could be the point of equal concentration. Design an experiment to determine the water potential of potato cells. The dialysis bag is an influence because of pore size in relation to the size of the water molecules.
We plotted the average percentage changes and graphed two lines to include and exclude our outlier. If the concentrations are unequal, the solution with the higher concentration is hypersonic, and the solution with the lower concentration is hypotonic. An answer key is provided on the last page of the document. Introduction - Osmosis is the process by which water molecules move from a region of low solute concentration to an area of high solute concentration through a semi permeable cell membrane until the concentration of water molecules in and out of the cell is at equilibrium. The concentration in the cells is much higher than the concentration on the solution. It is a disaccharide, with a combination of fructose and glucose. Method - Preliminary plan 1.
Observations - The potato strips that were immersed into the 10% and 25% sucrose solutions appeared to have wilted while the strip immersed into the distilled water seemed to be more rigid. However, if I did have time then I think it would have been much fairer if I had 22 test tubes, with only one potato chip inside it. This follows the same prediction as the one I made for the preliminary test. The loss of water and turgor pressure while a cell is in a hypertonic solution is called plasmolysis. Put each bag into a beaker of distilled water and let stand for half and hour.
They will observe the processes of diffusion and osmosis, first in two teacher-led demonstrations, and then through two lab activities: the diffusion of starch molecules through a plastic bag and potato cores immersed in isotonic, hypotonic, and hypertonic solutions. Materials: 6 12 inch Dialysis Tubing Strips 6 8 oz Cups 30 mL of Distilled Water Funnel 30 mL of 0. To determine the isotonic point of a sucrose solution and a potato 2. Evaluation Generally, I think my results obtained were fairly accurate. The concentration in the potato cell must have been lower than the water solution.
To download a copy of the lab packet with the instructions, lab report, and results tables, click the. In a low concentration of water the amount of solute e. In an isotonic solution, the concentration of solutes is the same inside the cell as it is outside of the cell. Osmosis, the process in which solvent molecules move from an area of lower solute concentration to an area of higher solute concentration, can easily be demonstrated with potato experiments. We can demonstrate this in a lab setting using potatoes.
Iodine starch indicator turns blue-black in the presence of starch and remains amber orange-brown when starch is not present. Through out the experiment we tried to submerge them simultaneously to yield the most reliable results. Osmosis is the diffusion of water from a high concentration to a low concentration and water was the variable being tested in this activity because it is what made the mass increase for every sucrose solution. Our writing firm offers the highest level of professionalism in handling your osmosis in a potato cells lab report and delivering satisfactory work at a student friendly fee which distinguishes us from other writing firms. The null hypothesis is that the solutions of different molarities of sucrose will not affect… 1183 Words 5 Pages glass was filled with cold tap water.
This is because there will be a higher sucrose concentration in the potato chip so water will go into the potato from the 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. If there was only a little sugar in the solution the potato chip increased in mass. · Several potato chips in one solution Fair Test To make sure my experiment is fair I am going to: · Make sure I use the same volume of solution in each test tube - 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. In science, the meaning of the word refers to the relative amount of one substance in another, i. Introduction I intent to set up this experiment using equally sized cylinders of potato submerged in salt solutions of different concentrations.
This parallels with the background research, where we found potatoes have little or no glucose. All strips need to be the same length to begin with. Included those on the enzyme catalase, or investigating osmosis with potato. I do not think it was very fair using two different surface areas of potato chips 1cm and 2cm. This is one of the driving forces of the cells in all living things. A semi permeable membrane is a membrane that only lets selected molecules to pass through it.
Osmosis will occur if the water potential of the cytoplasm of the cells is. If you have more water than you need, just stir well and then discard the excess. . Osmosis Lab Report and Questions. But in a low concentration of water the amount of solute e. The difference in mass is not enough to go by because the initial masses of the dialysis bags were not all the same.
A ib biology 1406 lab report the experiment report 2013 introduction: osmosis potato osmosis and diffusion lab report abuse print page: concluding recent. In the experiment we shall use; 10% sucrose solution, 25% sucrose solution, distilled water, a potato and test tubes. Diffusion results Sample Lab Report- Potato OsmosisOsmosisPotato. When a large volume of water enters the cell, it swells causing the membrane to push against the cell wall. To achieve more accurate data in the future, we could run more trials, and cut the potatoes with more uniformity and precision. Discussion: see lab grading guidelines. My biology class has just completed a practical activity on osmosis.