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

Find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller.

Extracts from this document...

Introduction

Introduction I intend to find out if different concentrations of sucrose solution cause a selectively permeable membrane, in this case a potato chip, to become larger or smaller. I plan to use six different concentrations of sucrose solution and for each concentration I will take three results. I will then find the percentage change for each result. Finally I will find the average weight change and the average percentage change. * Equipment * 150ml beaker * Ruler * Scalpel * Small cutting board. * Core borer * Sticky labels * Sucrose solution * Measuring cylinder (100cm3) * Stop clock * Test tube * Test tube holder * Mass machine Safety In our experiment we used a variety of equipment. Some of which were quite dangerous. For example we used the razors to cut the potato cells into shape so we had to be extra careful not to cut ourselves. We were in the presence of glass and ceramic so we had to be careful not to break anything. Fair test To create a fair test certain aspects of the experiment will have to be kept the same whilst one key variable is changed. ...read more.

Middle

So the water molecules concealed within the potato moved to the area of higher concentration (the sucrose in the solution) So if I put another piece of potato cell in a more diluted sucrose solution, (for example 75% water and 25% sucrose), it is very likely that the potato will increase in mass because the water molecules in the potato cell will diffuse into the cell making it grow. And if we put it in a more concentrated sucrose solution (for example 25% water and 75% sucrose) it is likely that it will reduce in size and decrease in length because the water molecules in the potato cell will diffuse into the concentrated solution. I can justify my prediction because when we placed the potato cell in 100% water for 10 minutes, the mass increased. When we put the same pieces into diluted sucrose and water, equally balanced in the experiment, the mass remained the same. However when I put the potato piece in concentrated sucrose its mass decreased. my graph shows the line of best fit for the average weights of potato chips before and after Osmosis in different concentrations of sucrose solution. ...read more.

Conclusion

Evaluation In my opinion the experiment was very successful. I obtained a large quantity of quite accurate results. I was able, from these results, to draw up a somewhat informative graph. I think I took enough results for the amounts of concentrations I was using. I also think that I gave the experiment ample time for Osmosis to occur. Maybe if I were to repeat the experiments again I would probably try using a wider range of concentrations as to find a wider range of more varied results. The most difficult part of this experiment, in my opinion, was the accurate cutting of the potatoes. It was very difficult to accurately cut the potatoes to the same length and to get them all to the same weight. To get more accurate results I could have used a scale to measure, instead of 0.0g, 0.00g. In my opinion, there were not many of my results, which were out of the ordinary. Slight differences may have been the result of human hands drying each, some more thoroughly than others. This could mean that some would have had more excess water than others, resulting in an increased mass. However, I think that my experiment was successful and I am quite pleased with my 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 GCSE Life Processes & Cells section.

Found what you're looking for?

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

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 GCSE Life Processes & Cells essays

  1. Experiment to show osmosis in potato chips in different concentrations of sucrose solution - ...

    In beaker A, using a measuring cylinder measure out 120ml of water and pour the water into beaker A. In beaker B, using a measuring cylinder measure out 60ml of water and 60ml of sucrose solution, mix the two together and pour into beaker B.

  2. Osmosis is defined as 'the movement of water molecules from an area of high ...

    test tubes as to not confuse myself as to which chip came from which solution. 8. I dried each chip with the paper towel and then placed each one, one by one, on the top pan balance to weigh them and their weights were recorded in a table.

  1. Osmosis, Aim: To investigate the movement of osmosis through a selectively permeable membrane, ...

    all of the others to make sure all potato slices are equal size. To also create a fair test certain aspects of the experiment will have to be kept the same whilst one key variable is changed. I have chosen to vary the concentration of the sugar solution and water.

  2. Osmosis is the passage of water molecules from a weaker solution into a stronger ...

    To make sure this is a fair test I will have to keep all the variables constant apart from the concentration. If I did change one of these variables, say surface area: if one potato chip were 1 cm longer than the other there would be more surface area for osmoses to occur, therefore the test would not be fair.

  1. Osmosis.I predict that the lower the concentration of the sugar solution, the larger the ...

    Sucrose Concentration (Mol per dm�) Mass Before (grams) Mass After (grams) Percentage change 0 0.2 0.4 0.6 0.8 1 To ensure this was a fair test, I had to make sure that each beaker had exactly 100ml of sucrose solution in them, they were the same temperature, that each potato

  2. To find out the net movement of water when potato chips are put in ...

    because of the expansion by osmosis, then it is said to be turgid. It is the turgidity of a plant's cells that helps it to stay upright. Plant cells are usually turgid. Below is a plant cell in pure water: - [image004.jpg] Another term is flaccid, which is the state

  1. My aim throughout this investigation is to investigate the movement of Osmosis through a ...

    to an area of low concentration (the potato). METHOD. For organisation we set up all out apparatus first. We set up 7 petri dishes labelling them individually to avoid confusion whilst taking readings. We filled the petri dfishes with the right concentrations of solution beginning at 0m and working up all the way to 1m.

  2. Looking at how concentration affects the movement of water particles through a partially permeable ...

    Water will move into plant cells by osmosis. * The cell membrane of the plant cell acts as a partially permeable membrane. * The cell sap inside the vacuole is a strong solution. * Water passes into the plant cell by osmosis.

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