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

In my experiment, my aim will be to find out if osmosis occurs in a potato, and how the potato will be affected in different molar solutions of sucrose and water.

Extracts from this document...

Introduction

The Study Of Osmosis in a Potato Aim: In my experiment, my aim will be to find out if osmosis occurs in a potato, and how the potato will be affected in different molar solutions of sucrose and water. Apparatus: > Stop watch - To time my experiment > Cutting tile - To cut the potato on it > Knife - To cut the Potato > Measuring cylinder - To measure the solutions > Distilled water - which is part of the experiment > Sucrose - Which is part of the experiment > Potatoes - Which is part of the experiment > Tissue paper - To dry the potato after the osmosis has taken place > Balance - to weigh the potatoes > Borer - to cut up accurate measurements of the potato Planning: Before I plan out my experiment, I am going to do some background information on osmosis; this will help me to make my prediction, Background information: Osmosis is the movement of water molecules from a dilute solution to a concentrated solution, through a semi-permeable membrane. The concentrated solution has molecules in it that are too large to be able to pass through the semi permeable membrane, but the water molecules are small enough to be able to diffuse through it. Therefore Osmosis is the diffusion of water molecules from a high water concentration to a lower water concentration throught a semi permeable membrane. ...read more.

Middle

Other than that there are not really any other safety issues in this experiment. Method: Firstly I will get the pieces of potatoes ready, I will push the borer through the potato, cutting it into long cylinders. And I will cut out 5 of these because I am going to be testing these in five different solutions of sucrose solution, 0.1, 0.2, 0.4, 0.6, and 0.8. I will weigh each set and have them ready to be put into the test tube of the different solutions. Once I have put them in I will start the stopwatch and will leave the potato cylinders in there for five minutes. Then once the five minutes are up, I will remove the potatoes, and blot dry tem with the tissue paper. This will ensure that I weigh only what is in the potato and not any liquid which may have been left on the surface. Then I will weigh them. Then I will record my results down onto a table. And I will repeat this three times to ensure the fair testing, and to make sure that there are no anomalous results which would have corrupted my conclusion. Obtaining evidence: Below are my results that I collected from my experiment. 1. Sucrose Solution Height Weight New Weight % Change 0.1 Molar 5cm 2.47 grams 2.59 grams 4.9 0.2 Molar 5cm 2.44 grams 2.50 grams 2.5 0.4 Molar 5cm 2.43 ...read more.

Conclusion

of where the graph line crosses over, we can see that a sucrose solution of roughly 0.3 molar will be the solution of where mass is neither gained or lost. Also this would be the concentration of the solution inside the potato. Evaluation: The experimental set-up was fine in showing the effects of osmosis in a potato. I am very pleased with my experiment and I believe it went very well, I came across no difficulties and there wasn't any anomalous results. I am certain that my results that I obtained were accurate when I carried out the experiment. I believe this because out of the three times that I carried out this experiment, they all showed virtually the same results. My results all agree with my prediction that the higher the concentration of sucrose solution the more mass the potato will lose and vice versa. My results also concur with the osmosis theorem. Osmosis is a special case of diffusion, where water molecules move from a high concentration to a low concentration, through a semi permeable membrane. If I were to do this experiment again, in order to improve it, I would do it using a greater range of concentrations to obtain more accurate results so that I am able to produce more accurate graphs. I would also measure the change in size of the potato pieces. Jonathan Suleyman - 1 - 01/05/2007 Biology Coursework ...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

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

    Sand Dune Succession Coursework

    5 star(s)

    * Count the number of different species in the quadrat. * Increase the quadrat size to 25 x 50 cm and count the number of new species found in the increased area. * Continue in this way, doubling the quadrat size each time.

  2. Marked by a teacher

    Biology coursework planning - the effect of lead chloride on the growth of cress ...

    5 star(s)

    This in turn, increases the reliability of the results. * The biomass of the cress seeds will be determined as an indication of the amount of growth in the different concentrations of lead chloride. This is has been discussed before; the reason being that measuring the length of the shoots does not take into account, lateral and root growth.

  1. Marked by a teacher

    Investigate the water potential of celeriac.

    5 star(s)

    However, when the concentration is increased to 0.5 mol dm-3, the percentage change in mass has decreased to 4.3%. Through sections A and B of the graph, the gradient of the graph stays almost constant. The average percentage mass decreases consistently at a similar rate until section C.

  2. beetroot experiment

    on the screen were constantly changing even when we placed the control 0,(distilled water) in the cuvette to the reset the machine, there was some cases when it was reading 0.03 instead of just 0. In some cases, the changing would stop but that could be a not so reliable sign that it is the right colour density.

  1. Investigating Water Potential Of Potatoes.

    It can often be observed on hot dry days. The plants usually recover at night when evaporation is reduced by closure of the stomata, but if the water supply to the roots is inadequate then permanent wilting occurs and the plant dies. Wilting is not to be confused with plasmolysis.

  2. To find out the factors affecting the refractive index of liquid by using different ...

    increases, in a linear relationship. The "Brother Gregory Investigation" website also mentioned that the refractive index of a solution is linear with weight % composition.1 As the concentration increase, the number of molecules increases; the density of the solution is higher.

  1. Investigation on Osmosis using a potato.

    this is because when using it make sure that the potato is firmly on a surface if not the cork borer may go into ones hand and damage skin tissues. But other than that, there were not any bigger matters to be cautious or concerned of.

  2. Investigation into the effects of different

    Maltose will have a slight effect on yeast growth. (Moderate number of yeast cells) Null hypothesis; Starch will have no effect on the yeast growth. Glucose will have no effect on yeast growth. Maltose will have no effect on yeast growth. Expectations; I will be expecting to see unequal strong foaming in the 3 test tubes (The 3 conditions,

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