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Experiment to find the effect of different concentrations of sucrose solution on osmosis using Visking tubing.

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Introduction

Experiment to find the effect of different concentrations of sucrose solution on osmosis using Visking tubing. Introduction Osmosis is a special type of diffusion, where water diffuses across a selectively permeable membrane. This would then stop as the concentration of water is equal on both sides of the membrane. The movement of water is from a lower solute concentration to an area of higher solute concentration. This leads to this experiment in which the Visking tubing will act as a membrane between the solutions. Knowing the above information, a prediction can be made such that a Visking tube containing a very low concentration of sucrose solution will have a less effect than that which has a higher concentration. This is due to the movement of water from the test tube into the visking tube. ...read more.

Middle

They were each then filled. The first was half filled with distilled water, being the 0.0mol dm-3 concentration of sucrose solution. The next three were filled with each of the other concentrations by syringe. To keep the experiment consistent they were all half filled. They were tied with another knot on the opposite end, keeping a small amount of space within the tube for the flow of water. The outside of the visking tubes were washed under a running tap and dried with paper towels, the knots were also squeezed to take out any water absorbed. Each was then weighed using the digital weighing scale and this mass was recorded in the results table. Once all four were measured, they were simultaneously placed into the test tubes on the rack, and the timing had begun. ...read more.

Conclusion

Percentage change in mass = mass - initial mass x 100 Initial mass Table 2 is shown in graph 1 on the following page. Conclusion This experiment was carried out to find the effect that different concentrations of sucrose solution have on osmosis using Visking tubes. The graph shows that there was a very low rate of diffusion within the visking tube containing 0.0mol dm-3 sucrose solution, and therefore the rate of diffusion gradually increases with increasing concentrations of sucrose solution. These results accept the prediction made. Diffusion should not occur when a visking tube containing distilled water is placed within a test tube containing distilled water, as the concentrations are equal. The tube containing 0.0mol dm-3 sucrose solution is distilled water, though in the graph a percentage change of 0.974% is shown. This could be due to human error of weighing the visking tube. As mentioned the knots absorbed some solution, if they were not dried, the weight would be more. ?? ?? ?? ?? Biology ...read more.

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