Ap Bio Diffusion Osmosis Essay

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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 Results The potato cores started to decrease in weight as the molarity went up.

Water molecules move from areas of a higher concentration to a lower concentration to move down their concentration gradient.

Because of this, the water molecules will move at a faster rate during osmosis and diffusion.

Osmosis Lab Report by Evan Gerber Claire Cambron First Lab Report Wednesday am February 20, 2013 Theresa Gburek Abstract The major objective of the experiment was to test the effect of the concentration gradient on the diffusion rate.

It was hypothesized that the greater the stronger the concentration gradient, the faster the rate of diffusion would be.Based on the data from the graph, the osmolarity of the potato was 0.4 M.Osmolarity is the molar concentration of when there is no change in the weight of the potato.The tubes were dried off and measured on the triple beam scale.The mass was taken and recorded for all three tubes.A higher temperature can cause osmosis to occur at a much faster rate because the molecules are more likely to pass through the selectively permeable membrane quicker than they would at a lower temperature due to the molecules’ higher energy.In addition, the size of the particles can affect the rate of diffusion through the membrane. In the experiment, the sucrose molecules are too large to pass through the dialysis bags while the water molecules are easily able to move freely in and out due to their small size.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 move from an area of high concentration to areas of low concentration is called Diffusion.To test this, dialysis tubes were submerged in different concentration fructose solutions.We weighed the tubes at specific time intervals to measure the rate of diffusion of water in each different solution.


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