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An investigation into the effect of glucose concentration on osmosis.

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Introduction

An investigation into the effect of glucose concentration on osmosis. The aim of my experiment is to investigate the effect of glucose solution on osmosis in potato chips. I shall be observing how the mass of the potato chip changes in different concentrations of glucose solutions. Simply, will the effect of the action of osmosis be affected by the concentration of the solution? Firstly, I measure the mass of the potato chips, each one was to be 10 grams in weight. The chip will be placed into a glucose solution of a certain concentration. After leaving the chip for an hour I shall take it out, blot the excess liquid and measure the mass. I shall record the differences in masses and then calculate the percentage weight changes of the recorded masses when a potato chip has been in different concentrates. To ensure that my results are as fair and accurate as possible shall use a number of controls. These will hopefully eliminate any extreme variables in my results. Firstly, I shall choose the same variety of potato for each chip because the permeable membrane will have a similar genetic makeup. ...read more.

Middle

This will minimise the effects of changes in temperature on the solutions used, for instance, risk of water loss due to evaporation, and the possible effects of temperature change on the action of osmosis. I did come up against a problem in that some potato chips floated to the surface of the higher concentrated solution, so excluding some of the cross sectional area from the solution. I did not find a remedy for this problem. Any possible remedy would be one that did not interfere with the solution or potato chip. If the chip does float to the surface during the experiment, I shall abandon that particular sample and repeat the process until a chip remained submersed. The glucose concentrations shall range from 0.0 mol/l, which is pure de-ionised water, to 0.2 mol/l, 0.4 mol/l, 0.6 mol/l 0.8 mol/l and finally the highest concentration which is 1.0 mol/l. These solutions were pre-prepared apart from the 0.0 mol/l. I predict that the mass of the chips will increase as the concentration of the glucose solution increases. ...read more.

Conclusion

I will then calculate the mass and express this as a percentage, using the formula below. Change in mass (g) ----------------------- X 100 Original mass (g) (g = grams) Apparatus . Thermometer - to check temperature of room . 6 small beakers . set of scales ( accurate to 1/100 of a gram) . scalpel . tweezers .whiteboard I intend to take 12 results, 2 from each level of concentration. I shall then calculate an average resulting in 6 results that will be used to plot on a graph. If I successfully implement the controls over the experiment (as outlined above) my results should be fairly accurate. Inaccuracies may occur if the conditions of the experimental environment are not adequately regulated. Any irregularities will be noted and taken into consideration when evaluating the final results. ?? ?? ?? ?? This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ ...read more.

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