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

An Investigation to Find the Effect of Changing the Sucrose Concentration on Osmosis in Potatoes.

Extracts from this document...

Introduction

An Investigation to Find the Effect of Changing the Sucrose Concentration on Osmosis in Potatoes Planning The aim of this investigation is to find out how the rate of osmosis in potatoes is affected by changing the concentration of the sucrose solution in which the potatoes are left overnight. This is how we did it : Method 1. Collect all apparatus necessary ready for use 2. Use the cork borer to gain four equal sized pieces of potato 3. Use a ruler and a scalpel to make sure the potato pieces are exactly equal. Weigh and record their masses 4. Fill four test tubes with the different levels of concentrated solution and label carefully 5. Add one piece of potato to each test tube 6. Leave for 24 hours 7. Gently pat dry, then weigh 8. Record results 9. Calculate mass gained/lost 10. Redo experiment another 2 times. Nb It is very important to try and be accurate when collecting results, so the results reflect what they are expected to. For these reasons, we used rulers to measure the length and width of the chips, and why we weighed the chips with a digital scale, which measured up to two decimal places. Valid Evidence To ensure that a valid test is carried out in this test, so that all the values are accurate, there are a few things you need to take into consideration. ...read more.

Middle

Here are the results we gained: Potato Solution 30% 15% 1% Water Mass Before 3.37g 3.47g 3.23g 3.55g Mass After 2.16g 2.67g 3.38g 3.74g Mass Gained -1.21g -0.71g 0.15g 0.19g In this experiment, the cork borer was 1.3 cm in diameter, which means that all the potato chips were 1.3 cm wide. These results show me roughly what the results I gained for the real experiment show. This is basically that the potato chips in the lower percent concentrations gained more in mass than those in the higher concentrated solutions. We can use these results to further back up our conclusion. Observations Below are the real results we got when we were doing the practical three times. You can see from the table that we used water, and 5%, 10%, 15% and 20% solutions in this experiment. Potato Solution 0% 5% 10% 15% 20% Mass Before (g) 2.93g 2.93g 2.92g 3.08g 2.82g Mass After (g) 3.14g 3.09g 3.03g 3.09g 2.83g Mass Change (g) 0.21g 0.16g 0.11g 0.01g 0.0g % Change 7.17% 5.46% 3.77% 0.32% 0% Average % Change +4.44% +3.03% +0.92% -1.09% -2.16% Turgidity Turgid Turgid Floppy Soft Floppy Mass Before (g) 2.88g 2.84g 3.0g 3.07g 2.90g Mass After (g) 2.96g 2.85g 2.97g 2.98g 2.75g Mass Change (g) ...read more.

Conclusion

Reliability I do not think that our results are very reliable, as the lines of best fit on my graph are not that close together. If my results were very accurate then the lines of best fit on my graph would be very close together, and there are not, though the second and third lines of best fit are closer together than the third is. Overall, I don't think that these results are very accurate. Although I do not think my results are very reliable, I do think that they are good enough to construct a firm conclusion, as they show roughly what I expected them to. Also, I have three sets of results, which all roughly resemble each other, so this must suggest that I did something right and that they are not totally wrong. Further Work If I had more time, as a way of extending this work, I could try to do an alternative experiment that might allow me to narrow down where the isotonic solution is in different vegetables. One of the vegetables I could use to illustrate this could be something like a swede or a parsnip, as they both have similar properties to that that a potato has. I could also use this to see if they absorbed as well as a potato and if osmosis would still work in these cases. ...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. Marked by a teacher

    Investigating the effect of Sucrose Concentration on the Rate of Osmosis in Potato Chips.

    5 star(s)

    * Once the experiment is complete, dispose of the polystyrene cups containing either distilled water or varied solutions of sucrose concentration, the potato chips featured in the experiment as well as wet tissues and repeat the whole test once more.

  2. Investigation into the Rate of Osmosis in Potatoes and to find out the Sucrose ...

    Plant cells do not burst in pure water, though, because they have a cell wall that is fully permeable so osmosis does not take place across it. It is bypassed and osmosis takes place between the cell membrane in the same way as an animal cell, but with the resistance

  1. Diffusion in Agar Block

    and this increases the speed of the reaction reducing the time taken for its completion. This also explains why smaller animals have to eat food more often than larger animals, this is because they have a larger surface area as compared to their volume and so they lose heat quickly

  2. Experiment investigating concentration of sucrose solution and potatoes

    New Dilutions: (all dilutions made for 25ml) Concentration of sucrose solution(molar) Amount of sucrose solution (cm3) Amount of water (cm3) 0.0M 0 25 0.2M 5 20 0.4M 10 15 0.6M 15 10 0.8M 20 5 1.0M 25 0 Observations: * Potato weight - 2.15 grams * Room temperature - 23 degrees * Sugar solution - 15 degrees

  1. An investigation into the effect of Sucrose concentration on osmosis

    * 1 chinagraph pencil - to label the test tubes and the different solutions. * 1 digital balance - to measure the mass of the potato cylinders. * Distilled water - to make up the different concentrations. * 1.0 Mole sugar solution - to make up the different concentrations.

  2. An Investigation Into the Effect of Sucrose Concentration On Osmosis (Using Potatoes).

    This is how the experiment will be carried out: *ALWAYS BORE THE POTATO ONTO A WHITE TILE* 1) Measure 30cm of each sucrose concentration (in this case 0m, 0.1m, 0.2m, 0.3m 0.4m and 0.5m). Place each different one in a different cup.

  1. Investigation Into How Osmosis In Potatoes Is Affected By Solution Concentration.

    It loses its turgor and becomes flaccid. If the external solution is strong enough, the cytoplasm eventually pulls away from the cellulose wall in what we call plasmolysis; I do not expect this to occur in this investigation, as the solutions I will be using will not be strong enough

  2. Investigating the effect of changing the concentration of a glucose solution on osmosis in ...

    The cells have a 'partially permeable membrane. The partially permeable membranes have small holes in, and only allow water molecules to pass through and not the glucose molecules because they are too large to pass through. When the cell fills with water, it becomes turgid and expands, and when the water moves out of the cell, it becomes flaccid, and returns to its normal shape.

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