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Effect of salt concentration on rate of osmosis
Effect of osmosis in plant cells
Effect of osmosis in plant cells
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Investigation of the Concentration and the Effect of Sucrose on Osmosis in Apple and Potato Tissues
INTRODUCTION: -
I will be doing an investigation on the topic of Osmosis (A special
type of diffusion).
The aim of this experiment is to investigate the effect of sucrose
concentration on osmosis in apple and potato tissues, to find out how
the concentration of sucrose solution affects the mass of potato and
apple strips. So therefore to find out about the uptake of water into
a cell which depends on two main factors, which are: -
Ø The water concentration of the solution
Ø The water concentration of the cell sap in the vacuole.
potato experiment
Diffusion is a movement of particles from an area of higher to the
area of lower concentration, (by random motion). Osmosis is also a
special case of movement of water, from a higher to a lower water
concentration across a selectively permeable cell membrane until it
reaches the equilibrium.
The process of osmosis makes plant cells swell up as you can see in
the diagram below which shows a higher water concentration outside the
turgid cell, whereas on the plasmolysed cell there is lower water
concentration outside. If a lot of the water leaves the cell, the
cytoplasm begins to peel away from the cell wall; this process is
called plasmolysis. This happens when the water moves into the plant
cell’s vacuole and pushes against the cell wall. In this case the
functions of the cell wall prevent the cell from bursting out. The
process of osmosis takes part in the root of the plant cell, which
takes in water from the soil by osmosis. This leads the water to move
along the root cell into the leaf, and so therefore the water
constantly moves to areas of lower water concentrations.
[IMAGE]
The process of osmosis also occurs in animal cells, but in an animal
cell there isn’t any cell wall to prevent them from swelling. This
means if they were to be placed in pure water, they would take in
When the cell has all the water it can take inside of it the osmosis
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. 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. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
* Note the mass down in the table at the end of the first page.
molecules go in and out of the cell. There is no net movement of water
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
I am going to carry out an experiment to measure the change in mass of
To investigate the osmotic effect of changing the concentration of sucrose solution; distilled water, 20% sucrose solution, 40% sucrose solution, 60% sucrose solution on the change in mass of potato cylinder after 30 minutes of being in solution.
Water Potential of Potato Cells Aim: To demonstrate the Water Potential of Potato Cells. Objectives: · To show the water potential of potato cells using various measured concentrations of a sucrose solution and pieces of potato. · To record and analyse data to verify observed results. · The method and procedure was carried out as per instruction sheet. Observations: The experiment shows that the lower the concentration of the sugar solution, in the Petri dish, the mass of the potato increased.
the same way as it does potato. I would also widen the range of sugar
repeat the process 3 times in total to ensure a fair test. At the end
When I am not using them I will place them away from my experiment and
Determining the Concentration of the Cell Sap in Potato Storage Tissue Aim: To determine the concentration of the cell sap in potato storage tissue. By using Osmosis, determine what the sugar concentration of cell sap is. Prediction I predict that the potato segment in the distilled water will definitely gain in weight because the solution outside it has a much higher concentration of water then in the cell sap meaning Osmosis will occur and the potato segment take in water. I predict that 0.2M sugar solution will also gain weight because it still has quite a high concentration of water outside the potato. The potato in the 0.4M solution will gain weight but the potato in the 0.6M and 0.8M solutions will lose weight.
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.
When you place a potato chip in a salt or sugar solution, then if the