Diffusion Osmosis Lab Report

1295 Words6 Pages
Ellice Johnson
Period 1
October 12, 2012

Diffusion and Osmosis Shown In Solutions
Section 1: Abstract
This lab, title Diffusion and Osmosis, was centered around the diffusion across a cellular membrane and how exactly materials move and diffuse in concentrations. Both diffusion and osmosis are forms of movement that are part of passive transport dealing with cell membranes. Diffusion is where the solutes move from an area of high concentration to a low concentration. Water goes through the cell membranes by diffusion. Osmosis is specifically the movement of water through membranes. Since osmosis and diffusion are both part of passive transport, this means that they do not require energy or pumps. There are different environments
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I took the five dialysis tubings which were acting as cells and filled them with 10 mL of each solution. We knotted each end but made sure to leave enough space at the top for water to diffuse in the cell. The initial weight was taken and recorded in a data table. The five cells were placed in a beaker filled with water for 30 minutes. After the 30 minutes, the cells were weighed, and the final weight was recorded in the data table, and then the percent change was calculated. The materials used in this procedure were beakers, water, sucrose, glucose, NaCl, ovalbumin, 20 cm-long dialysis tubing and balances.
In the inquiry, I predicted that the blue solution was water and that it would have an isotonic environment, meaning there would be no percent change.I first cut the potatoes into
6 cylinders of the same size by using a cork. I got six beakers and filled each with 20 mL of the different color-coated solutions with different concentrations (orange, red, yellow, green, blue purple). The initial mass of each potato cylinder was taken before placing in the solution. I placed the potatoes in the appropriate labeled beaker (1-6) of each solution and let them sit there for 30 minutes. After the 30 minutes, I took the final mass of each cylinder and calculated the percent change in mass.The materials that were used in the inquiry were potatoes, corks, pipettes, balances, scalpels, beakers, and the color-coded sucrose solutions.
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