• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

This is an experiment to find out what factors affect osmosis in potato chips.

Extracts from this document...


Osmosis Coursework Introduction This is an experiment to find out what factors affect osmosis in potato chips. The experiment will inform us of how osmosis work and how the mass of potato chips change when put in different concentrations of sucrose solution. Equipment The equipment needed to carry out this experiment successfully and accurately 1. Test Tube Holder- To hold the test tubes whilst the experiment is happening 2. Boiling Tubes x6- To hold the potato and solution 3. Top Pan Balance- To measure the potato chips' mass accurately 4. Potato(s)- The use as the carrier of the product of osmosis 5. Scalpel- To cut up the potato chips 6. Large Knife- To peel the potatoes and to assist in cutting them into chips 7. Tweezers- To move the potato chips 8. Tissues- To blot excess water 9. Pipette- To transfer solutions 10. Sucrose Solution- The variable. Solutions needed in concentrations of 0.2 0.4 0.6 0.8 and 1.0 11. Distilled Water- (used as the value 0.0 concentration.) 12. Chopping Board- To chop up the potato 13. Goggles- To protect our eyes from harmful substances 14. Measuring Cylinder- To measure out the amount of solution accurately 15. ...read more.


Finally I am going to have to make sure that the potato chips are submerged within the solution for the same period of time so that the experiment is accurate. When taking the precautions just mentioned and being generally careful when performing the experiment the results should be reliable. One way to insure reliable results is to take repeat readings and then obtain a average reading. It is likely that I will get anomalous results on the overall trend but I will try to find a cause or explanation for each one. I have done some preliminary work and research also. I have learnt about osmosis and I have done an experiment involving a high glucose solution and some viscing tube (which is a semi permeable membrane.) This gave me a basic knowledge of which solutions I would need and which equipment was most suitable for my experiment I then extended my knowledge by doing some preliminary results by performing the actual experiment. Here are the results Sucrose Solution Mass in grams before Mass in grams after Percentage change 0.0 1.49 1.61 8.05% 0.2 1.19 1.27 6.72% 0.4 1.35 1.41 4.4% 0.6 0.87 0.89 2.23% 0.8 1.45 1.36 -6.2% 1.0 2.65 2.29 -15.58% In order to find the percentage mass change I did the simple equation The initial preliminary results would coincide with my prediction. ...read more.


The line crosses the y-axis at approximately 0.5 so this is the predicted equilibrium. It is expected that at this point there would be equal water potential levels and therefore no molecules would be exchanged. The graph defiantly proves my prediction to be right. Evaluation I feel that overall the experiment went well. My measurements were accurate and as my graph would show my precautions paid off. There are many ways that I feel my method could be improved for example a more precise way of controlling the amount of moisture lost when blotting the chips of excess water. Also being able to insure the quality of the solution. This we were unable to do. We believed and hoped the solutions were of a good quality but could not prove or ensure it. I probably would have got more accurate results and have been able to prove my theory about sucrose solution at concentration 0.5 if I had a higher range of concentrations such as 0.1, 0.3, 0.5, 0.7, 0.9. If I had taken more sets of results I would have been able to have maybe produced a better explanation for my anomalous result in results B(0.8 concentration). Overall I have enjoyed the experiment and am happy with the results. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Exchange, Transport & Reproduction section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Here's what a teacher thought of this essay

3 star(s)

Overall a reasonably good account of an osmosis investigation with a clear plan and explanations showing a sound understanding of principles. More focus on control variables would have improved the method and better use of precise scientific language would have improved the quality.

Marked by teacher Adam Roberts 11/04/2013

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Exchange, Transport & Reproduction essays

  1. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    If the right side of the membrane represents a cell and the left side is a hypertonic solution, then the cell would become flaccid and possibly collapse due to the large loss of water 4. Hypotonic solutions If in the above diagram, the red dots represent solute molecules and the

  2. Marked by a teacher

    Mr Chips: Investigation to find an isotonic solution for potatoes

    4 star(s)

    in each dilute solution. The dependant variable is the factor influenced by the experiment and is a measure of the change in mass of the single potato chips. This will be calculated on a top pan balance and measurements taken before and after the experiment.

  1. Marked by a teacher

    The Effect Of Temperature On The Permeability Of The Cell Membrane

    3 star(s)

    This will make it a fair experiment because uneven pieces of beetroot can mean that big pieces will leak more than smaller pieces. Weigh the beetroot using a balance at 1g. Wash the beetroot with distilled water because it is purer than tap water.

  2. Marked by a teacher

    Daphnia experiment - Does caffeine affect heart rate?

    3 star(s)

    A limited amount of daphnia should be given to each pair, a way to look at this is if each individual were to adhere to their own experiment, there would be a decrease in the amount of daphnia and this would cause a major disruption in the food chain, and could have some deadly effects.

  1. Marked by a teacher

    Investigating osmosis in plant tissue.

    3 star(s)

    We did however pick up a few anomalous results along the way, the 0.8 molar experiment didn't go quite as well as all the others, the reason for this was half way through the experiment one of the members of a neighboring group knocked it over, this affected the results

  2. Osmosis in Potato cells

    To explain why the control variables had to be controlled and how they were, I have drawn up a table below: Control variables Why it has to be controlled How I will control it Type of potato. Different potato types contain more water than others, if it were not controlled

  1. The Effect of Different Substrates on the Rate of Respiration on Yeast (Saccharomyces cerevisiae).

    12 1110 12 1140 12 1170 12 1200 12 Table 4 There are no results for the trial experiment for lactose because no gas was produced.

  2. beetroot experiment

    Two tails are the two hydrocarbon chains of phospholipids. The tails of the phospholipids orient towards each other creating a hydrophobic environment. The bilipid layer is semi-permeable, meaning that some molecules are allowed to diffuse freely through membrane. Molecules that can diffuse through the membrane due so at differing

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work