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To investigate the effect of sucrose solution on osmosis.

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Introduction

Elliot Smith 15th October 2001 AT1: Osmosis AT1: To investigate the effect of sucrose solution on osmosis. Aim: Osmosis is the change of water from a weak solution to a strong solution. We are going to try and establish osmosis in potato chips by using different concentrated sucrose solutions with H2O (water): 0.0 mol sucrose 0.2 mol sucrose 0.4 mol sucrose 0.6 mol sucrose 0.8 mol sucrose 1.0 mol sucrose Prediction: If I changed the amount of sugar I predict that the potato will be lighter because osmosis will be increased. If I changed the amount of light, then I predict that nothing will happen because osmosis does not need light. If I change the volume of sucrose in the water, I predict that the more sucrose present, the lighter the potato. I have chosen to change the volume of sucrose. Apparatus: 6x test tubes 4x potatoes 1x bore 1x scalpel 1x pepite 1x ruler 1x scales 6x different concentrated solutions Method: I am going to try and effect osmosis by using different concentration levels in six different test tubes. ...read more.

Middle

I shall then weigh them and make sure that they are within 20mg of each other. The weight of which small 5x1cm shall be going in which test-tube, will be recorded so that I can find a correct reading when I find the results out. I shall put each 5x1cm blocks in order and leave them for 1hour and 30 minutes. After this time is over I will take them out and put each set on a paper towel each. I shall leave them for five minutes and then weigh them. If the mass is less it means that the osmosis process was helped by the sucrose. I shall work this out by dividing original weight by after experiment weight then times it by on hundred. Fair Test: I shall make this a fair test by, making sure that nothing is changed apart from the amount of sucrose in the solution. I shall be repeating this whole experiment twice to make sure that I get a fair and average result. ...read more.

Conclusion

After Recording (grammes) 0 1 2.7 3.14 0.2 2 2.76 2.84 0.4 3 2.81 2.77 0.6 4 2.82 2.44 0.8 5 2.78 2.27 1 6 2.8 2.11 Conclusion: Using this graph can see that the sucrose has made a definite and obvious difference. With 0.0 % sucrose (distilled water), the weight of the potato weight has gone up. This is due to the solution to travel freely along the osmosis passage (diagram shows this in osmosis section). When the concentration level was 0.2 it shows that there was a slight change, in that the weight only goes up about 0.10 grammes. This because the solution is limited to how much it can travel along the osmosis passage (see diagram in osmosis section). For the rest of the test tubes in each of the two experiments it is obvious that the passage of solution gets limited as the concentration contains more sucrose. This shows that sucrose is a strong solution and that it can not pass along the osmosis passage (see diagram in osmosis section). Evaluation: The stronger the solution of sucrose concentration, the less osmosis can happen. AT1 INVESTIGATING OSMOSIS IN POTATOES! BY ELLIOT SMITH ...read more.

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