The Effect of Changing Solute Concentration on Osmosis in Potato Tissue
Aim
The aim of the investigation is to find out the effect of changing
solute concentration on osmosis in potato tissue.
Prediction
I predict that if the solute solution is more concentrated than the
potato, the potato chip with the more water potential will lose water,
so if the potato chip is placed into a dilute solute solution, the
potato will gain water. Here's the example- if the original cells is
5g then and placed into a diluted solute solution the mass will raise
to 7g. And if the potato chip is to be placed into a concentrated
solution, the potato chip's mass will drop to around 3g. I predict
this because of the process of osmosis.
Diffusion is the movement of particles from a region of its high
concentration to a region of its concentration. Osmosis is a special
kind of diffusion which involves water.
The definition of osmosis is - 'the net movement of water molecules
from a region of high water potential to a region of low water
potential across a semi- permeable membrane.'
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This is a diagram showing where water from the dilute solute solution
on the left passes through the semi- permeable membrane and moving
into the high concentrated solute solution on the right.
If we add a potato tissue into a diluted solute solution, this makes
the solute solution have a higher water potential compared to the
potato tissue. Therefore the water from the surrounding solute
solution will move into the potato chip to try and balance the water.
This makes the potato chip to rise in mass by increase in water. When
the cells have gained lot of water and they are strong, we call these
cells turgid.
Gaining Water through osmosis
Normal Cell
Turgid Cell
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Therefore, if we add a potato tissue into a concentrated solute
solution, this make the solute solution have a lower water potential
Measuring The Rate Of Osmosis In Potato Cells Skill Area P. Osmosis is defined as free water molecules diffusing from a high concentration to a low concentration through a semi-permeable membrane. Variables - The rate of osmosis effected by many different living things, temperature of the solutions, surface area over which it can occur, Volume of solution, Volume of potato, distance through which the free water molecules have to pass and finally the difference in concentration of the solutions. This final factor is the one that we are going to test during the experiment. The temperature increase causes the cells to expand so the whole potato expands. Different volumes of potatoes at different temperatures could be measured, however trying to measure the temperature of a potato effectively without causing defects in other results would be quite hard with the equipment we are using.
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.
The Effect of Water Concentration on the Mass of Potato Tissue Aim: The aim of this investigation is to discover the effect of water concentration on the mass of potato tissue, and also to investigate the movement of osmosis through potato tissue. Scientific Knowledge: When a substance such as a sugar dissolves in water, the sugar molecules attract some of the water molecules and stop them moving freely. This, in effect, reduces the concentration of water molecules.
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 Effect of Different Strength of Salt Solutions on Potato Cells Through Osmosis An Investigation to find out how different strengths of salt solution affect potato cells through osmosis. Aim I aim to investigate the effect of different concentrations of salt solution on potato cells when osmosis occurs. Introduction I intent to set up this experiment using equally sized cylinders of potato submerged in salt solutions of different concentrations. I will then observe the percentage change in mass over a set period of time. This will show me how much osmosis has occurred.
* Note the mass down in the table at the end of the first page.
When you place a potato chip in a salt or sugar solution, then if the
through the visking tube with salt in. As in the visking tube it has a
I am going to carry out an experiment to measure the change in mass of
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.
the same way as it does potato. I would also widen the range of sugar
cylinders which will be kept at 4 cm. I will keep it the same length
How Osmosis In Potatoes Is Affected By Solution Concentration Aim To investigate how the concentration of a salt and water solution affects the rate of osmosis in a potato. Osmosis Osmosis is the passage of water from an area of high water concentration to an area of lower water concentration, through a partially permeable membrane (a membrane which allows small molecules like oxygen, carbon dioxide, water, ammonia, glucose etc to pass through, but does not allow larger molecules such as sucrose, starch, protein etc). Cell membranes are partially permeable, which allows water to pass from one cell to another within the organism, and also, as I will be exploring in this investigation, from outside to inside, or vice versa. Osmosis occurs when the area of liquid outside the cell contains more water particles than the area of liquid inside the cell. In the solution, the particles are moving all the time.
The data in both Table 2 and Graph 1 show that as the concentration of sodium chloride (%) is increased from 0% to 10% when there is a significant increase in the % change in mass, thus also the rate of osmosis. Between concentrations 0% and 2% there was a rapid % change in mass. At 0% NaCl the % change in mass was +1.63% indicating that the potato piece had gained water because the concentration of solute must have been higher in the potato than in the solution. The % change in mass at 2% NaCl concentration was -8.82%, the negative indicates that the potato piece had lost water as the concentration of solute was higher in the solution than the potato piece. From 2% to 4% NaCl solution the %change in mass was slightly less rapid but still had an increase from -8.82 to -14.7, respectively. The graph had a slower decreasing trend from 4% NaCl solution onwards, this can be seen from the gradual plateau of the graph. The slowest increase in %change in mass of -0.04% was between 6% to 8% valued at -16.5% and -16.9%, respectively. The % change in mass increased slightly from -16.9% to -17.5% between 8% to 10% NaCl concentration. This suggests that the rate of osmosis had begun to stabilize and may be the result of the concentrations of both the
When I am not using them I will place them away from my experiment and