The effect of solute concentration on osmosis in potatoes
Plant cells react to osmosis by hypertonic, isotonic and hypotonic. There is a constant movement of various molecules in and out of the cell that brings nutrients in and brings waste out.
This was achieved through placing potato cores in different concentrations of sucrose 0. In this experiment, we put pieces of potatoes into test tubes with sugar solutions of different concentrations and leave them there over night. The one in the salty solution will have shrunk, indicating that water is diffusing from a less concentrated solution to a more concentrated solution.
The one in the tap water solution, in contrast, will actually swell slightly, indicating that it is taking in water.
Place each potato slice into each of the solutions, and leave the slices in the solutions for a half hour.
Osmosis experiment with potato and sugar solution pdf
When a substance, such as sugar which we will be using in the experiment we are about to analyse , dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely This is because there will be a higher sucrose concentration in the potato chip so water will go into the potato from the solution. Water molecules have mass and so the decreased number of water molecules results in decreased mass. To do this I will conduct an experiment. At first most water movement is into the cell. Keywords Hypertonic — is when the water outside of the cell is lower than that inside. 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 Length - Length changes were minimal as minimal water was lost. Strips in water Description - Turgid Mass - The increase in mass of the potato strip in water is due to the movement of water molecules into the plant cells via osmosis. You can use potatoes to set up osmosis experiments for students of all ages and levels. Potatoes are full of both water and starch, and will gain water when immersed in watery solutions. If however there is less water outside the potato than within, then I shall expect the potato to shrink in size. I predict that when there is a high concentration of sucrose the potato will lose mass.
Make solutions of saline in three different concentrations, 20 percent, 0. Risk assessment, Procedure, Results, Analysis and conclusion, Evaluation, Sources or error, Anomalous results, Biological or industrial significance, Health and safety.
In this experiment, dialysis…. The second chart shows the results of another group, who used the same method but recorded change in length rather than change in mass.
Weigh and measure each potato strip, recording the initial mass and length Place a strip in each petri dish, taking care not to mix the strips.
Weigh each strip and measure each potato strip, recording the final mass and length.
Sources of error in osmosis potato lab
Research question: What is the solute concentration of a potato? To reach an equivalent osmotic potential the concentration of water molecules has to be equal on either side of the partially permeable membrane If a piece of potato is too big I will use a scalpel and a tile to trim it so they are all the same weight and then place these into a test tube each. Risk assessment, Procedure, Results, Analysis and conclusion, Evaluation, Sources or error, Anomalous results, Biological or industrial significance, Health and safety. Turgor pressure is the pressure exerted against the cell wall by contents of the cell. Name and describe the four main types of tissues in animal ii. I will hold the test tubes in a test tube rack. Osmosis is the diffusion of water. And if the cell would be in a isotonic environment, then the cell would turn flaccid and wilt. Observe that the slice placed in salt is very flexible, while the slice placed in sugar is flexible, but less so. If however there is less water outside the potato than within, then I shall expect the potato to shrink in size. As the turgor pressure increases water will begin to diffuse out of the cell at a greater rate, eventually equilibrium will be reached and water will enter and leave the cell at the same rate This was achieved through placing potato cores in different concentrations of sucrose 0. Water molecules may move in and out of the cell, but there is no net diffusion of water. Simply, will the effect of the action of osmosis be affected by the concentration of the solution.
The initial mass of potato is noted before being placed in the solution. Osmosis is the diffusion of water through a partially permeable membrane from a high concentration gradient, to a low concentration gradient
How does sugar concentration affect osmosis in potatoes
Leave both in their respective solutions for half an hour, then remove the potato halves from their solutions and observe their differences. A process called osmoregulation which is provided by the kidney to regulate the concentration of water and salt in the blood the process also controlled by the hypothalamus in the brain. If the plant cells would be in a hypertonic environment, then all the water would leave the cell making it plasmolyzed. I will use these values to find the solute potential by using the calibration graph. This was achieved through placing potato cores in different concentrations of sucrose 0. Finally, we investigated the effect of solute concentration on the tonicity of cells in plant tissue and Elodea. However, if a potato is submerged into a distilled water beaker or a low sucrose concentrated solution, its size, as well as the mass, will increase. Hypothesis: Osmosis is the movement of water across the membrane from an area of high concentration to an area of low concentration. 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. Version Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report.
based on 37 review