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

Find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sugar and water.

Extracts from this document...

Introduction

Aim: My main aim in this experiment is to find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sugar and water. Factors * Type of cell * Different solutions * Concentration of solution * Time cells are in solution * Mass of cells * Surface area of cells * Temperature of solution Prediction Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. In the distilled water, I believe that the water is more concentrated in the potato, and therefore the water should transfer from the water to the potato, making the potato bigger in size, and heavier in mass. The potato tissues, being surrounded by a weak solution, will be most likely to swell up and become turgid, taking in all the water it can possibly take in. With the potato in 5% solution of sugar, I don't think there will be much change in the mass of the potato. This is because there isn't much difference between the two substances. I believe that the mass and the size of the potato won't be altered much. ...read more.

Middle

Fair Test If I am going to make this a fair test, then I will have to control these factors. Doing the tests at one fixed temperature will control the temperature of the water. For the purpose of my experiment I am going to do all the experiments at room temperature. The size of the potato is very important. This is because if the size of the potato varies, so will the amount of mass it can loose or gain. I am going to try to cut all the pieces of potatoes, to the same size. Because of the 'chipper� I will have chips with the same width but the length of the chips will differ. I am going to cut the chips to 3cm in length. The mass of the potato is a variable, and this means that it will be measured throughout the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in the solution, and after. This will allow us to see whether osmosis has taken place, and how much osmosis has occurred. The volume of the solution that the potato chips are kept in must be the same. ...read more.

Conclusion

It is a strong negative correlation. As the concentration increase the mass decreases. For the concentrations' 10%, 5% and 0 %( distilled water) the mass of the potato increased. For 15% the mass stays almost the same with just a tiny increase. For concentrations' of 20% and 30% the mass decreases. 15% is the equilibrium Evaluation We followed the plan correctly; I believe we gained accurate and sufficient enough results to conclude the experiment, and to prove our hypothesis. My final results were very reliable, due to the precautions I took to make this a fair test. I think I took enough results for the coursework. The range of results was big enough. Also to make my experiment more accurate I could have repeated it more. I could have also cut the potatoes into slices, to give a larger surface area for osmosis to occur on. I could extend my coursework by testing the chips using a different substance. By this I mean using a different thing instead of sugar, i.e. salt or coffee. Then I could find out whether osmosis occurs differently with different things diluted in the water. I could even use different vegetables. . . . Biology Coursework Investigate the effects of placing cells in different solutions Ben Hall ...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. My main aim in this experiment is to find out if osmosis occurs ...

    And that is why I take this into consideration, no matter what. I will be using a very sharp knife, which could injure someone if it's not handled properly. And i will also be careful that the solutions don't get into our bodies internally, just in case, because i am

  2. Potato tissue's mass difference, when placed in different concentrations of sugar solutions.

    For example the age and sizes might be different, which means one potato might have more water in them then another. 3: Stop the evaporation of any of the molar solution. This is because if the sugar solution evaporates past the level of the potato, then the potato sample will

  1. In this coursework I am going to investigate the factor how different concentrations of ...

    This liquid or hydrostatic pressure works against osmosis. Turgidity is very important to plants because this is what makes the green parts of the plant stand up into the sunlight. When plant cells are placed in concentrated sugar solutions they lose water by osmosis and they become flaccid.

  2. In my experiment I plan to find out whether the concentration of sugar in ...

    They will then be placed in each of the test tubes, and will be left in the test tubes for around 24 hours. After 24 hours, I will weigh the potato chips, and see whether they have lost or gained mass by comparing the results I received before the potato

  1. My main aim in this experiment is to find out if osmosis occurs in ...

    I will try and get the measurements of the potatoes as accurate as possible for every single potato, evenly cutting the potato pieces, and making a record of the length to the nearest millimeter. And i will be using a very sensitive balance so that i can get the best readings possible.

  2. The effects of different salt solutions on potatoes

    First of all I will take core samples of apples and measure out the different concentrations of salt solutions into five containers. I will label them and place the potato cores next to the containers. During this procedure I will have implemented the fair test conditions on the previous page.

  1. Find out if osmosis occurs in a potato, and how it affects the potato ...

    - to weigh the potatoes � Cork borer - to cut out potato cylinders Prediction The potato, cut up into pieces, will need some sort of element to survive, and in this experiment, it would be light and water. With both of these sources, the potato will keep on working,

  2. My main aim in this experiment is to find out if osmosis occurs in ...

    My theory in this experiment is that, due to the difference in the water concentrations of the two substances, I believe that the weight of the potato will start decreasing when it is tested on 0.2 molar solutions of sucrose and greater.

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