Osmosis Lab Report
Introduction
Cells have to interact with their environment, chemicals and water and in order to do so they must be able to move across the cell membrane and the cell. The movements within a cell are called Diffusion. When molecules move across a cell membrane it is known as Osmosis. Diffusion is the process by which molecules of a substance move from areas of higher concentration of that substance to areas of lower concentration. Diffusion can be the transfer of anything anywhere. However, that is not true for osmosis. Osmosis is diffusion, but a specific type of diffusion. Osmosis is only the diffusion of water molecules through a selectively permeable membrane and a concentration gradient. Only certain molecules can cross the membrane …show more content…
If the solution outside the cell has a larger concentration of dissolved materials the solution is hypertonic, so the water would move from the cell into the solution.
Aim
The aim of this experiment was to verify the concept of Osmosis and Diffusion with a semi-permeable membrane (dialysis tubing), it will be exposed to different environments and concentration gradients.
Hypothesis
I thought that that dialysis tubing would end up weighing more as there would be less water and more molecules within the tubing so water would move through the semi-permeable using a concentration gradient into the cell.
Variables
Independent Variable Solution
Dependent Variable - Weight of the dialysis tubing
Controlled Variable - Length of dialysis tubing - Amount of substance in each of the tubes - Amount of water in the beakers
` - Measuring in the same measurement - Time between each weighing session
Unable to control Variables - Temperature in room and beaker …show more content…
You then add 2" of 10% Salt solution into the tube, and close the top end of the tube, fold it and tie a string over the top so it is fully sealed. Once done we cleaned the outside of a tube by rinsing it and then using paper towels to dry it. These steps were repeated for the egg white, sucrose and starch solutions. Then immediately weigh the tubes on an electronic scale (make sure it is set to 0) using grams and mark down the readings. Then place each tube in a 250ml beaker with enough distilled water to cover all of the tube. Mark each beaker so that they do not get confused. Then after every ten minutes for one hour you take the tube out, dry it off and weigh it whilst writing down what the scale was
Cells have to interact with their environment, chemicals and water and in order to do so they must be able to move across the cell membrane and the cell. The movements within a cell are called Diffusion. When molecules move across a cell membrane it is known as Osmosis. Diffusion is the process by which molecules of a substance move from areas of higher concentration of that substance to areas of lower concentration. Diffusion can be the transfer of anything anywhere. However, that is not true for osmosis. Osmosis is diffusion, but a specific type of diffusion. Osmosis is only the diffusion of water molecules through a selectively permeable membrane and a concentration gradient. Only certain molecules can cross the membrane …show more content…
If the solution outside the cell has a larger concentration of dissolved materials the solution is hypertonic, so the water would move from the cell into the solution.
Aim
The aim of this experiment was to verify the concept of Osmosis and Diffusion with a semi-permeable membrane (dialysis tubing), it will be exposed to different environments and concentration gradients.
Hypothesis
I thought that that dialysis tubing would end up weighing more as there would be less water and more molecules within the tubing so water would move through the semi-permeable using a concentration gradient into the cell.
Variables
Independent Variable Solution
Dependent Variable - Weight of the dialysis tubing
Controlled Variable - Length of dialysis tubing - Amount of substance in each of the tubes - Amount of water in the beakers
` - Measuring in the same measurement - Time between each weighing session
Unable to control Variables - Temperature in room and beaker …show more content…
You then add 2" of 10% Salt solution into the tube, and close the top end of the tube, fold it and tie a string over the top so it is fully sealed. Once done we cleaned the outside of a tube by rinsing it and then using paper towels to dry it. These steps were repeated for the egg white, sucrose and starch solutions. Then immediately weigh the tubes on an electronic scale (make sure it is set to 0) using grams and mark down the readings. Then place each tube in a 250ml beaker with enough distilled water to cover all of the tube. Mark each beaker so that they do not get confused. Then after every ten minutes for one hour you take the tube out, dry it off and weigh it whilst writing down what the scale was