Investigate how the Concentration of Sucrose Solution affects the Mass of the Potato Chip
Aim
To find out how the concentration of sucrose solution affects the mass
of the potato chip left in the solution for one day.
Water Potential:
The water potential of a solution is a measure of whether it is likely
to lose or gain water molecules from another solution. A dilute
solution, with its high proportion of free water molecules, is said to
have higher water potential than a concentrated solution, because
water will flow from the dilute to the concentrated solution (from a
high potential to a low potential). Pure water has the highest
possible water potential because water molecules will flow from pure
water to any other aqueous solution, no matter how dilute.
Prediction:
Osmosis is the passage of water molecules from a weaker solution to a
stronger solution, though a partially permeable membrane. In this
case, the tiny holes in the membrane of the potatoes will allow the
water molecules to pass through in and out of the solution and the
potato, depending on the concentration gradient of the two substances.
Semi-permeable membranes are very thin layers of material which allow
some things to pass through, but prevent others. A cell membrane is
semi permeable. They allow small molecules like oxygen, water, amino
acids etc. to pass through but will not allow larger molecules like
sucrose, starch, protein etc. through. A region of high concentration
of water is either a very dilute solution of something like sucrose or
pure water. In each case there is a lot of water: a high concentration
of water. A region of low water concentration is the opposite of the
above, i.e. a very high concentration of...
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...pressure of the cell is
so high that no more water can enter the cell. This liquid or
hydrostatic pressure works against osmosis. Turgidity is very
important to plants because this is what makes the green parts of the
plant "stand up" into the sunlight. Austen denied discogal_87's
postmodernism .
When plant cells are placed in concentrated sugar solutions they lose
water by osmosis and they become "flaccid"; this is the exact opposite
of "turgid". If you put plant cells into concentrated sugar solutions
and look at them under a microscope you would see that the contents of
the cells have shrunk and pulled away from the cell wall: they are
said to be plasmolysed.coab abr seababw orab abk inab foab ab.
When plant cells are placed in a solution which has exactly the same
osmotic strength as the cells they are in a state between turgidity
and flaccidity.
I also predict that solution concentration 0.3 will be isotonic because of the pressure potential. As the water moves into the cell it pushes up against the cell wall this is called the pressure potential and it increases the water potential until an equilibrium is reached, and because the cell is so inelastic it takes very little water to achieve this. That's why I believe in-between 0.3 and 0.4 will be isotonic as it is very close to pure water. Background Information Osmosis - The net movement of water molecules from a region of high water potential to a low water potential, through a selectively
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.
Plasmolysis However when the plant cell is placed in a more concentrated solution the water inside the cell passes out the cell. The cytoplasm... ... middle of paper ... ...
The water molecules move freely through the semi-permeable membrane; this is a passive process. We will do this experiment by placing potato chips in different strength solutions and checking for mass increase/decrease. Prediction I hypothesize that if we place potato chips in different strength solutions that there should be different results, some with noticeable changes in mass, the other will be nearly the same. The potatoes should gain/lose mass by the movement of water. If there is a change in mass, it is because water has entered or left the cell.
If a plant cell is places in a hypotonic solution the cell has a lower water concentration to that of the solution. Water will move into the cell by osmosis from a high water concentration outside the cell to a lower water concentration inside the cell through a selectively permeable membrane. The cell becomes turbid
This is because the water molecules passed from a high concentration in the water, to a low concentration, in the piece of potato. Therefore, the potato in higher water concentrations will have a larger mass than in higher sucrose concentrations. i.e. The potato pieces are shown to have water potential. The attached graph shows the concentration of the sucrose solution plotted against the average mean change in mass.
So what is happening is water is moving from a high concentration, i.e. a dilute solution to a more concentrated solution. Preliminary Work on Osmosis I am going to test carrots in a small osmosis experiment to see how the experiment works with carrots and salt solution and water. Variables 1) Temperature - Keep the same 2) Number of days left soaking - Keep the same 3) Size of beaker - Keep the same 4) Size of carrots - Keep the same 5) Concentration of salt solution -
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This is because the water molecules pass from a low concentration to a high concentration, (in the potato chip). Therefore, the chips in low concentrations will gain mass and have a greater length height than in higher concentrations such as 1molar of sugar solution. If there is no gain or loss in height or mass then these will be the isotonic points of the potato cells. The isotonic point is where the cells are not increasing or decreasing in size and is known to be in a state of equilibrium. Apparatus: 1.
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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.
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How the Concentration of the Substrate Affects the Reaction in the Catalase Inside Potato Cells
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Osmosis is the passage of water molecules from a weaker solution to a stronger solution through a partially permeable membrane. A partially permeable membrane only allows small molecules to pass through, so the larger molecules remain in the solution they originated in. Solute molecule [IMAGE] [IMAGE] Water molecule [IMAGE] The water molecules move into the more concentrated solution. When water enters a plant cell it swells up. The water pushes against the cell wall and the cell eventually contains all that it can hold.