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

To see the effect Osmosis has on a potato chip after a certain time in different concentrations of water; these include: distilled water and 0.2M, 0.4M, 0.6M, 0.8M and 1.0M sucrose solutions.

Extracts from this document...

Introduction

Results Solution Test 1 Test 2 Test 3 Average Difference (g) Mass Before (g) Mass After (g) Difference (g) Mass Before (g) Mass After (g) Difference (g) Mass Before (g) Mass After (g) Difference (g) Distilled Water 1.98 2.43 +0.45 1.61 1.98 +0.37 2.08 2.51 +0.43 +0.417 0.2M sucrose 1.61 1.71 +0.1 1.93 2.05 +0.12 1.51 1.64 +0.13 +0.117 0.4M sucrose 1.81 1.67 -0.14 1.51 1.43 -0.08 1.41 *N/A* N/A -0.073 0.6M sucrose 1.67 1.73 +0.06 2.04 2.08 +0.04 1.81 1.46 -0.35 -0.083 0.8M sucrose 1.66 1.19 -0.47 1.61 1.17 -0.44 1.74 1.27 -0.47 -0.46 1.0M sucrose 1.94 1.39 -0.55 1.53 1.16 -0.37 1.43 1.08 -0.35 -0.423 Investigation to see the effects of Osmosis - Matthew Voss Aim To see the effect Osmosis has on a potato chip after a certain time in different concentrations of water; these include: distilled water and 0.2M, 0.4M, 0.6M, 0.8M and 1.0M sucrose solutions. Prediction Osmosis is defined as the passing of water from a high concentration to a lower one through a semi-permeable layer, in an attempt to try and even out a water concentration. Here is an example of water passing across the concentration gradient: To prove the theory of Osmosis we are using chips of the vegetable potato. Plants naturally have semi-permeable skins to allow the passage of water and each plant cell has a vacuole, which is used to store water. ...read more.

Middle

Then averages all three of the results, this will give a more even picture of what's happening, try and ignore any anomalous results, as they tend to interfere with the averages. This proves that osmosis exists: the passing of water through a semi-permeable layer. Summary In summary I predict that the potatoes exposed to higher concentrations will loose the most water thus decreasing most in mass and those exposed to the lower concentrations will not shrink and may even grow in mass. Here is a diagram to show how the potato's plant cells would react in a high concentration. Analysis of Evidence From my table and my graph I can see that there is a negative correlation in the way that the average difference in mass of the potato chip gets smaller and smaller. The line of best fit on my graph travels negatively down the graph proving there is a correlation between sucrose solution water and change in mass of potato. This means that the higher the molar of sugar concentration in water, the smaller the difference in mass. Even to the extent where the potato chip actually gets smaller in mass than before it was put in the solution. This means that my prediction was correct in the way that I said the potato would grown in low concentrations and shrink in high ones. ...read more.

Conclusion

The electronic scales we used were extremely accurate, recording mass in grams to 2 decimal places. In summary this experiment isn't very accurate compared to it being done in better-controlled conditions, such as a university laboratory. On a whole I think the experiment was suitable as it properly showed how osmosis worked across a concentration gradient (ignoring the anomalous results). In general it would be useful for other science groups to do the same experiment to find evidence of osmosis and I encourage teaches use this experiment as an example. There are several improvements that could be made to the experiment, for example: if I were to do this experiment again I would use more exact equipment, such as burettes for measuring out the solution. I would also design a set time to leave the experiment instead of roughly estimating two days like we had to because of social limitations. To create a more detailed graph I would use more concentrations of water, such as 0.3, 0.5, 0.7, 0.9 as well as the original concentrations. Also I would do higher concentrations as to find the exact point of total saturation of the potato. In summary we managed to prove the existence of osmosis and how it changes under different concentrations. The main idea of this experiment was to prove that water will attempt to even out concentrations of itself to create an equilibrium and I think we did this. ...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. Osmosis is defined as 'the movement of water molecules from an area of high ...

    However, the relatively low number of solutions tested (5) means that there is a range of possible values for the osmolar concentration of sap in the cell, and means that we cannot accurately predict values for volume change at different concentrations.

  2. Use scientific knowledge and practical skills to determine the effect of a range of ...

    In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentration gradient of the two substances. So in this case, when the water concentration is lower in the

  1. Osmosis in potatoes at different concentrations of sucrose solutions.

    The weight before the experiment was 3.52 grams and after the experiment, it dropped to 2.6 grams. Also, I thought that the weight might also change during the experiment because water has its own weight and density. So if water moved out of the chip, there could be mass decrease and vise versa.

  2. Investigation to see how different concentrations of a sucrose ...

    These will all work differently with osmosis as they are all different in size, with some being one cell thick and the others larger. The larger sugar molecules will slow down osmosis by taking up more space, meaning that water molecules will have less space in which to move around and reach the selectively permeable membrane.

  1. The Chip Problem

    Therefore all the beakers will have the same conditions which will help to make the test fair. After 24 hours I will take out the slices of chips and weigh and measure them to see if they have changed size or mass.

  2. The effects of different concentrations of sucrose on potatoes

    other solution is molecules from a region in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules such as water through but does not allow bigger molecules to pass through.

  1. Investigate the effects of varying concentration of certain solutions on the amount of osmosis ...

    Using this information, I have come to the prediction that with a high concentration of sucrose in the water, the mass of the potato will decrease and the cells will become plasmolysed. In a low concentration of sucrose the cells will become turgid.

  2. Find out if osmosis occurs in a potato, and how it affect the potato ...

    By researching information about osmosis, and making predictions of the results, I believe the graph would look something like this: Fair Test Fair testing should play a big part in this experiment. If this experiment isn�t a fair test, we will be obtaining the wrong results, which could lead us to the wrong conclusions.

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