When the water potential of the surrounding solution is less negative
than that of the potato cells, water enters the cells’ vacuoles by
osmosis causing the turgor of the cells to increase.
Method
1. Using a cork borer remove a core of potato.
2. Use a white tile to push the cork borer into the potato.
3. Using a scalpel or razor blade cut the skin off the ends of the
potato cores.
4. Cut the potato cores into 30 disks 5mm thick, using a ruler to
measure the thickness.
5. Place the disks into a petri dish to prevent the evaporation of
water
6. Make different concentrations of sucrose solution 0.1, 0.2, 0.4,
0.6, 0.8 molar and distilled water. Place the solutions into a water
bath to keep then all at the same temperature.
7. Remove 6 disks at a time from the petri dish and weigh them using
an electronic balance. Record the weight of the potato chips. Then
place in each different solution.
8. Shake solutions every 10 minutes. After 1 hour remove the disks
from the solutions, blot dry and reweigh.
9. Then repeat the experiment 3 times so an average of results can be
taken to give a more accurate result and show any anomalies.
Independent variable-Different solutions
The independent variable in the experiment is the different
concentrations of solution.
I am going to make the following solutions using salt and water.
0= pure water
1= NaCl (salt)
1 mole= Relative molecule mass (g) dissolved in 1000cm3 of water
58.5g (NaCl) in 1000cm3 water = 1 molar solution
5.85(g) in 1000cm3 of water = 0.1 moles
So therefore:
0.1molar = 0.585(g) in 100cm3 water
0.2molar = 0...
... middle of paper ...
... out more clearly if there
were more repeats, and the longer the chips are left in the longer
there is for osmosis to occur.
However I do feel that the experiment was carried out to a suitable
degree of accuracy. As when I cute the potato chips I put then all
straight into a petri dish to ensure that no evaporation occurred.
Furthermore, all of the potato chips were left in the solutions for
the same amount of time. In addition to this when I was making up the
salt solutions I used a graduated pipette to measure the solutions
which provided very little chance of human error in measurement.
Finally, the percentage change was calculated to plot the graph to
make the experiment a fair test.
If I were to repeat the experiment I would take the above points into
account to make the experiment as accurate as possible.
If we say that the right hand side in picture 1 is the potato, and the
9. Gather all the cornrows together, add some gel to the nape area and brush the hair up
Investigating Osmosis In A Potato Introduction: "Osmosis is typically defines as the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. Many membranes allow all or none of the constituents of a solution to pass through; only a few allow a selective flow. In a classic demonstration of osmosis, a vertical tube containing a solution of sugar, with its lower end closed off by a semi-permeable membrane, is placed in a container of water. As the water passes through the membrane into the tube, the level of sugar solution in the tube visibly rises.
Then, the weight hanger is removed, the platform is spun until the indicator bracket and disk realign, and the apparatus is timed for ten revolutions. To proceed, the radius is changed and the experiment is run identically until measurements are made for five different radii. For the second experiment with variable mass and fixed radius, the apparatus is set up similarly to the first experiment, but the side post stays at the same radius while the weights on the weight hanger are changed. Again, the indicator bracket and disk are lined up for each trial, the weight hanger is removed, and the apparatus is spun for ten, timed revolutions. Likewise, five different weights are measured. In order to calculate the unknown mass of the hanging
Green Grass, Running Water by Thomas King is a Canadian novel featuring Native Americans in the midst of their traditions in accordance with the rulers of the modern world in the book, the Whites. Several characters are seen to engulf in a battle with discrimination in an attempt to stay united as a community and find continued happiness in their Native identities. In Green Grass, Running Water by Thomas King, the author states that discrimination negatively affects happiness, which leads to the questioning of one’s confidence that in turn has a negative effect in their search for identity. Although this novel’s characters forgo several acts of discrimination, Robinson Crusoe’s Friday discovery of home, Lionel’s realization of his identity,
time. Once I had all my apparatus set up I was ready to start the
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.
Was it six days or about eight days? Both are correct. It’s simply a matter of observing the same period of time from a different viewpoint.
Media in the Green Grass Running Water is a reoccurring motif that symbolizes the progression of a society’s colonialization. The map symbolize the physical representation of how media is use to colonialize society. A colonial society uses television to promote an acceptable lifestyle; whereas, an image captures the essence of a moment in time. Maps are an essential media that helps society to colonialize citizens, because the map not only separates the land but it also creates division among the people.
Water Potential Investigation Aim: To determine the water potential of potato cells and sweet potato cells during the process of osmosis. (Only water molecules can pass through by the process of osmosis) Osmosis is the movement of water particles from a low region of water concentration to a high region of water concentration through a partially permeable membrane. A partially permeable membrane is known as the barrier which allows certain substances to move across, such as water molecules which move through freely, but prevents the movement of other substances, like sucrose. [physioweb.med.uvm.edu/bodyfluids/osmosis.htm & www.purchon.com/biology/osmosis.htm] The cell wall of a plant cell is made up of insoluble cellulose fibres which are embedded in a matrix of pectin and other materials. The fibres are very strong and often arranged in layers in which they are orientated in different directions.
there would be no flow of water into or out of the cell so the cell
- It still takes some time as you do need about 15 minutes to perform the routine correctly, and you have to perform 1 routine for 6 days a week.
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.
When I am not using them I will place them away from my experiment and
4. Put each group of potato discs in one of the 6 test tubes and watch