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

Osmosis, This experiment is about how osmosis works in a potato. I am going to do this by using different solution water and pouring the water in a tube and see what effects its going to have on the potato.

Extracts from this document...


INVESTIGATING OSMOSIS PLANNING This experiment is about how osmosis works in a potato. I am going to do this by using different solution water and pouring the water in a tube and see what effects it's going to have on the potato. Hypotheses I think some of the potato will expand and lose weight and some potato will gain weight. Predict I predict that the potato with less concentration of salt will gain weight and the potato with high concentration will lose it weight. Conclusion I am going to carry out this experiment using potato and different solution of salt water and also a control test. In which I will use tap water to see the difference in between. EXPERIMENT Introduction Osmosis is defined as the net movement of water or any other solutions 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. It is measured in the change of mass of the partially permeable membrane. As we know, sucrose molecules can not pass through a cell wall, but it does affect osmosis in potato cells, because if there is a high concentration of sucrose in a solution then there will be a low concentration of water molecules. ...read more.


To make the experiment fair I measured the potato accurately before cutting. I also carried out a control test in which I used tap water to see w hat happens. I saw that the potato swelled up because water entered the cells by osmosis. I weighed the potato before putting the solutions in. Improvements I could have been made through the measuring of the length of the potato chip as I found this very hard, I could have used a ruler along with a microscope to see exactly that I was cutting on the mm mark rather than a couple of mm away. A more defined measuring cylinder could have been used too. I could have used a bigger cylinder with spacings easier to measure to. I could have included more observations as they only really said what the pieces felt like, not what they looked like which would have been easier to compare. My test could have being unfair because when I cleaned the potato I might have lost its skin due it and might have squashed it a little when I was drying it. I could have measured the potato cells after the experiment to see if the salt water is affecting the size of the potato. ...read more.


From the line of best fit that has been added in, it can be seen that all of my points were very close to creating a perfectly smooth curve. This shows that my results are fairly reliable. My graph fits in with my prediction. In my original prediction I said that the lower the concentration of the sugar solution, the larger the mass of the potato will increase because the cell wall of the potato chip will allow the smaller molecules such as the water molecules to pass through but won't allow bigger molecules to pass through such as the sugar molecules. So if there is a high concentration of sucrose in the solution then their will be less water molecules to diffuse into the potato chip, so more water molecules are needed to dilute the solution, therefore the potato chip will decrease in mass because the water molecules have passed from a higher concentration of water molecules to the lower concentration of water molecules. Therefore a potato chip put into a higher concentration of water than sugar in the solution will increase in mass, but a chip put into a solution which has a higher sugar solution than water solution will decrease in mass. My prediction was correct because in my results the sucrose concentrations of 0 to 0.4, the potato chips mass increased and the concentrations of 0.6 to 1, the potato mass decreased. ATIF ESHAQUE KAMAL 1 ...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 Green Plants as Organisms 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 Green Plants as Organisms essays

  1. Determine the water potential of potato tuber cell with the varying affect of solute ...

    will have the 0.20 mol dm-3 solute in the other test tube and so on. This means that we have to vary the concentration of the solutes. This variation must be controlled. I will do this by making sure the solution is not changed once it is at the desired concentration.

  2. Free essay

    Investigation osmosis in potato cells

    Planned/detailed method: A range of sucrose solutions will be prepared with concentrations 0.2 molar, 0.4 molar, 0.6 molar, 0.8 molar and 1 molar. This will be done by adding varying amounts of distilled water to varying amounts of sugar solution.

  1. The effect that different concentrations of salt solution in the water has on strips ...

    The water acts like it's trying to dilute it, so as to 'equal up' the concentration rather side f the membrane. Osmosis makes plant cells swell up if they're surrounded by weak solution and they become turgid. In pure water the potato strips swell because water enters their cells by

  2. In this investigation I am going to find out how a chip is affected ...

    Method 1) Set up and create concentrations. 2) Take 5 core samples from a potato then measure them individually. 3) Place one core sample into each of the salt concentrations and leave it there. 4) Every 10 minutes take out each core sample and dry in on a paper towel then weigh it and record the mass.

  1. Test on osmosis and its effect on pieces of potato

    from the potato to the surrounding hypertonic solution as the net movement of molecules is from a higher concentration to a lower one, and in this case the water inside the potato would be more. Whereas in distilled water the level of water molecules outside the cell would be relatively

  2. Osmosis, I predict the mass of potato will first increase then start decreasing as ...

    Preliminary test: I did a preliminary test to finalise how I will be doing this experiment. Concentration of salt solution M 0.0 0.2 0.4 0.6 0.8 1.0 Mass before of potato cylinders (g) 0.41 0.44 0.44 0.42 0.44 0.43 Mass after of potato cylinders (g)

  1. What effect does the sucrose concentration have on osmosis?

    Hypertonic - In biology, a hypertonic cell environment has a higher concentration of solutes outside of the cell. Hence, in a hypertonic environment, osmosis causes water to flow out of the cell. If enough water is removed in this way, the cytoplasm will have such a small concentration of water that the cell has difficulty functioning.

  2. Osmosis investigation. My prediction is that as the concentration of the solute increases, ...

    3. Once the revised 30 min time period for the potatoes is up I will drain all the tubes in a manner so that the potato pieces are still in their tubes. I will take them to the scales and one at a time I will roll them on paper towel to soak up excess (undiffused)

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