The Molarity of Sugar Solution Inside Potato Cells
Background Information
Osmosis
Osmosis is the passage of water from a region of high water
concentration through a semi-permeable membrane to a region of low
water concentration. Semi- permeable membranes are very thin materials
which only allow certain things to pass through them. They will allow
small molecules like Oxygen, water and Carbon Dioxide to pass through.
Water molecules can pass across the cell membrane in both directions.
Cell membranes will not allow larger molecules to pass through them
though like sugar or protein. Osmosis occurs when you put an animal or
plant cell into liquid containing water. If the medium surrounding the
cell has a higher water concentration than the cell the cell will gain
water by osmosis.
Diagram Osmosis Diagram
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Sugar solution
[IMAGE][IMAGE] [IMAGE]
Potato sticks
Apparatus
· Medium beaker
· Tile
· scalpel
· potato
· sugar solutions
Method
· First of all I peeled the skin of the potato and made five sticks
and approximately cut them to the same shape and size using a scalpel.
· I then dried the potato chips and measured the mass. We used 0.0M,
0.1M, 0.2M, 0.3M, 0.4M, 0.5M, 0.6M, and 0.7M concentration of sugar
solution.
· After leaving the potatoes for two days I dried the potato chips and
measured the change in mass.
· I then repeated the experiment and calculation of change in mass to
have reliable results.
Fair Test
I changed the concentration of sugar solution each time. I had to keep
these factors the same:
· Temperature at 20 degrees C
· Number of potato sticks, 5 in each.
· Volume of sugar solution (150ml)
· Time (2 days)
Prediction
From my background knowledge I predict that as the molarity of sugar
increases, the mass of potato will decrease. This will happen because
osmosis will take place.
If we say that the right hand side in picture 1 is the potato, and the
Method: [IMAGE] Equipment needed: Ruler Measuring Cylinder Scalpel Tongs Pipette Thermometer Tri-pod Stop-clock Gauze Delivery Tube Bunsen Burner Beaker Matches/Lighter Potato Hydrogen Peroxide Solution (20%) Water Lead Nitrate The skin of the potato was removed using a scalpel and then cut into 1cm², using a ruler to measure the size of each cube, four cubes are required for each experiment, and therefore at least 36 cubes are required for the full experiment to take place. Fill a beaker half way with water, and place a thermometer in the water. Allow the thermometer to warm to room temperature to gather an accurate reading, and measure the temperature, using the thermometer. A measuring cylinder was used to put 10ml of Hydrogen Peroxide Solution into a
* Note the mass down in the table at the end of the first page.
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.
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
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
repeat the process 3 times in total to ensure a fair test. At the end
Investigation of the Concentration and the Effect of Sucrose on Osmosis in Apple and Potato Tissues
We then put the stopwatch on and left them for half an hour. After we weighed each potato tube and recorded our results. We did the experiment twice. We did this to make sure our results were correct. Preliminary method: We did everything the same as in our other experiment except we
How the Concentration of the Substrate Affects the Reaction in the Catalase Inside Potato Cells
4. Put each group of potato discs in one of the 6 test tubes and watch
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