Lab Report - Osmosis in Dialysis Tubing Emily Rushton Lab...

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Osmosis in Dialysis Tubing Emily Rushton Lab Section 925 February 18 th , 2008
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Abstract The objective of this lab was to look at the rate of osmosis in different sucrose solutions using dialysis tubing. This experiment was executed with dialysis tubing to represent a cells semi-permeable membrane and ability to perform osmosis. The overall result showed that the increased percentage of sucrose also increased the rate of transfer from outside the cell to the inside, increasing the weight in 4 of the 6 tubes. The results were generally the same as my personal predictions, however, I believed that at least one bag would burst, but none of them did. Introduction Osmosis is the net movement of water across a selectively permeable membrane. This action is driven by a variation in solute concentrations on both sides of the membrane. A selectively permeable membrane is one that permits unobstructed passage of water, but not solute molecules or ions. The difference between osmosis and diffusion is that in osmosis, it is the movement of water, and diffusion is the movement of a solute (things that are dissolved in the water) to move from an area of high concentration to one with a low concentration. A differentially permeable membrane allows only smaller molecules, such as water, to move through the membrane of a cell, or, like in this experiment, dialysis tubing. In a phospholipid, when the water enters the cell it can become full or even burst, this is referred to a hypertonic solution, meaning that the cell is more concentrated that the outside of the membrane with water. If too much water leaves the cell it can become “puckered” and this is called hypertonic to the
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This note was uploaded on 04/07/2008 for the course CHM 231 taught by Professor Barrows during the Winter '08 term at Grand Valley State.

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Lab Report - Osmosis in Dialysis Tubing Emily Rushton Lab...

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