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An experiment to show osmosis in potato chips in different concentrations of sucrose solution - also investigating how potato chips change in volume and weight when placed in different concentrations of sucrose solution

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  • Essay length: 3237 words
  • Submitted: 06/08/2003
  • Marked by teacher: (?) Stevie Fleming
  • Awarding body: Not known/Not applicable
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Teacher essay summary

3 star(s)

*** Overall a well planned and carried out experiment which needed more thought put into the discussion of results and the evaluation of the method.
Planning was well carried out with a trial experiment. The prediction could be made clearer. If the prediction could be made quantitative ( perhaps by doing some background research) this would be helpful
Obtaining results The student carried out and trial experiments and a good range of the independent variable with a fair number of repeats. The student should try to ensure all units and concentrations are clearly recorded. It would have been better to only use one method of recording the dependent variable. This would have allowed more time for repeating anomalous results.
Analysing Evidence and Evaluation The graph was not available to view. The student needed to explain the extent to which the conclusion supported the prediction and look at ways of improving the reliability of the evidence. The student should try to account for the anomalies mentioned.

Marked by teacher Stevie Fleming 01/01/1970

The first 200 words of this essay...

Factors affecting osmosis in potato tissue

Introduction:

I am going to design and modify an experiment used to show osmosis in potato chips in different concentrations of sucrose solution. I am also going to investigate on how potato chips change in volume and weight when placed in different concentrations of sucrose solution. I will also conduct a preliminary experiment before my final experiment.

Aim:

To investigate the effect of different concentration of sucrose solution on potato chips.

Hypothesis:

I would expect the potato chips to turn flaccid when they are placed in a strong sucrose solution because the water from within the cells will diffuse out leaving the potato flaccid. The potato chips left in the weak sucrose solutions should turn turgid in a weak sucrose solution, due to the water being absorbed by osmosis into the cells of the potatoes, this will make the potato chip larger in size. I should also be able to find some potato chips, which have neither increased nor decreased in size because the concentration in the potato is the same as the sucrose solution, so no mass or length would be gained or lost.

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MbT essay summary

*** Overall a well planned and carried out experiment which needed more thought put into the discussion of results and the evaluation of the method.
Planning was well carried out with a trial experiment. The prediction could be made clearer. If the prediction could be made quantitative ( perhaps by doing some background research) this would be helpful
Obtaining results The student carried out and trial experiments and a good range of the independent variable with a fair number of repeats. The student should try to ensure all units and concentrations are clearly recorded. It would have been better to only use one method of recording the dependent variable. This would have allowed more time for repeating anomalous results.
Analysing Evidence and Evaluation The graph was not available to view. The student needed to explain the extent to which the conclusion supported the prediction and look at ways of improving the reliability of the evidence. The student should try to account for the anomalies mentioned.

Marked by teacher Stevie Fleming 01/01/1970

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