Investigating the Factors that Affect Water Uptake by Potatoes
Plan
Osmosis is the movement of water from a region of a high concentration
to a low concentration of water through a selectively permeable
membrane.
Aim
To find the concentration of the solution in the vacuole of the
potato.
Prediction
I predict that when the potato chip is placed into the water solution,
its mass will increase because that water moves from a high
concentration to a low concentration. When the potato chip is placed
in 100% salt solution, I predict its mass will decrease.
Variables
* Concentration of the salt
* Size of the potato chip
* Time of incubation
* Variety of potato
* Skin on potato chip
* Temperature
* Volume of water
Scientific Explanation
I think that when the potato chip is placed in water its mass will
increase because water moves from a high concentration to a low
concentration. This process is called osmosis which is the movement of
water from a high concentration to a low concentration through a
selectively permeable membrane.
The water is stored in the vacuole in the cell of the potato chip and
as that expands then so does the mass of the potato chip.
Method
The following apparatus were used:
* Scales
* Potato chip
* Water solution
* Measuring jugs + beakers
* Thermometer
* Boiling tubes
* Stop clock
* Knife
* Pipette
Salt Concentration (m)
Volume of water (cubed cm)
Volume of salt solution (cubed cm)
0
30
0
0.2
27
3
0.4
24
6
0.6
21
9
* Note the mass down in the table at the end of the first page.
potato chips left in a sugar solution for a period of 1 hour. I will
cork borer and a ruler. I will keep the potato chips the same size in
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
Osmosis in Carrots Background Osmosis is the diffusion of water from a dilute solution to a more concentrated solution through a partially permeable membrane, which allows the pass of water molecules but not solute molecules. [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]If a cell is placed in a less concentrated solution water enters because the less concentrated solution will have a high concentration of water than the inside of the cell. Once the cell takes in maximum water the cell becomes turgid. If the cell was to be placed in a high concentrated solution, water would leave the cell because the cell would contain a low concentrated solution. So in the low concentrated solution there will be a high concentration of water and in the high concentrated solution there will be a low concentration of water.
there would be no flow of water into or out of the cell so the cell
The. So if there is a lot of salt dissolved into water surrounding the organism (in this case a potato chip) then water particles from. other cells are going to attempt to equal the concentration of water. in the solution with the water concentration in the cell. Therefore most of the water from the cells of the potato chipping will change in mass, depending on the concentration of solution.
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.
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
Investigation of the Concentration and the Effect of Sucrose on Osmosis in Apple and Potato Tissues
== = This experiment is based on the concept of Osmosis. Osmosis is the diffusion of water molecules from a region of high water concentration to a low water concentration through a semi permeable membrane (in this case, the cell potato cell membrane). The cell walls of the potato cells are semi permeable meaning that water molecules (which are small) can fit through but other bigger molecules such as glucose cannot pass through. The water molecules can flow both ways through the membrane, letting molecules both in and out.
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.
Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water