Osmosis and Diffusion Lab Report Introduction All Cells Contain Membranes That Are Selectively Permeable, Allowing Certain Things to Pass Into and Leave Out of the Cell. the Process in Which Molecules of a Substance
1016 WordsOct 18th, 20125 Pages
All cells contain membranes that are selectively permeable, allowing certain things to pass into and leave out of the cell. The process in which molecules of a substance move from an area of high concentration to areas of low concentration is called Diffusion. Whereas Osmosis is the process in which water crosses membranes from regions of high water concentration to areas with low water concentration. While molecules in diffusion move down a concentration gradient, molecules during osmosis both move down a concentration gradient as well as across it. Both diffusion, and osmosis are types of passive transport, which do not require help.
When the concentration of the environment outside of the cell is lower than the inside…show more content…
However one beaker received 100 mL of Deionized water with a molarity of 0.0. Afterwards a cork borer was pushed through the potato and was twisted back and forth. Once the borer was filled it was removed from the potato. Pushing the potato cylinder out of the borer, this this step was repeated six more times in order to get seven undamaged potato cylinders. Using a sharp razor blade, the potato cylinders were both cut to a uniform length of about 5cm, and were removed of their potato skins. The potato pieces were also cut in half to give the cells a greater surface area in which it was easier to absorb the solution. After the cylinders were weighed on a balance and the data was recorded in Table 4. Using the razor blade each potato was cut lengthwise into two long halves. Then the potato pieces were transferred to the water beaker and the time they were submerged was recorded. This step was repeated for all potato cylinders in which the pieces were placed in solutions 0.1 to 0.6 M. The potatoes were incubated for ninety minutes. At the end of the incubation period the time was recorded. Then the potato piece was removed form the first sample. Next potato pieces were weighed the and the final weight was recorded in Table 4. This procedure was repeated until all samples had been weighed and recorded in the chronological order they were initially placed in the test solution. Afterwards the table was completed by recording the
Osmosis in Potato Cells Essay
1030 Words5 Pages
Osmosis in Potato Cells
The aim of my experiment is to investigate the effect of glucose solution on osmosis in potato chips. I shall be observing how the mass of the potato chip changes in different concentrations of glucose solutions. Simply, will the effect of the action of osmosis be affected by the concentration of the solution?
Knowing that osmosis (a diffusion of water) will occur across a semi-permeable membrane whenever there is a difference between the water concentrations on the two sides of the membrane, and knowing that when this happens to cells they will either become turgid if water flows into them, or plasmolysed if…show more content…
This is because the water molecules will be moving more quickly. Careful though, if you heat something like the potato chip up too much then you will simply destroy all the cells.
* Difference in concentrations - This will speed up the rate of osmosis because there will be more particles that'll have to change places.
* Surface Area - This will speed up the rate of osmosis because there will be more space on the potato for osmosis to take place.
* Concentration of water in potato - the higher the concentration of water in the potato the quicker osmosis will happen because less water will have to diffuse into the potato to even the amounts of water inside and outside the potato.
I predict that the mass of the chips will increase as the concentration of the glucose solution increases. I predict that as the solution then becomes more concentrated, the increase in mass will begin to decline and eventually the chips mass will decrease from its original weigh. Therefore more concentrated the solution is, the lower the mass gain should be. The reasons for my predictions are that when the solutions concentration is low the water in the solution (outside the potato and its cells) is greater than that inside the potato