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

The effect that different concentrations of salt solution in the water has on strips of potato, due to osmosis

Extracts from this document...


Iestyn. Evans 11D Biology Coursework - Osmosis For my biology coursework a will be conducting an experiment to discover the effect that different concentrations of salt solution in the water has on strips of potato, due to the effect of osmosis. The experiment will be conducted by having different test tubes each filled with a different concentration of salt solution, and 2 strips of potato. Each test tube is then left for 24 hours and then the changes recorded. But for the changes to be recorded I must decide on a factor to record. I shall decide on a factor to record, to see what effect osmosis has on the factor, and to record any change in that factor from the start at the end of the experiment. I have decided that factor shall be mass (of the potato strip), because in my opinion that is the factor that can be recorded with the finest accuracy. So the potato strips will be weighed (separately) at the start of the experiment, and recorded, weighed after the experiment, then recorded again. Then the percentage change (in mass) of the potato strip worked out for each individual strip worked out. As there will be two strips for each tube, I will have two percentage changes, so the average percentage change will be worked out for each tube. The results will then be recorded in a table, and then a graph. Now I shall put forward my hypothesis, which is, a short statement saying what I think will happen - As the concentration of salt solution in the water increases, the mass of the potato strips in the water will decrease. ...read more.


There will be 2 test tubes for each concentration labelled A and B, so in all there will be 12 test tubes. 12 strips of potato shall be cut with a size 2 borer, and at a length of 3 cm, and a strip of potato placed in each test tube. But before being placed in the test tube each potato strip must be weighed on an electronic scale and recorded in a table. After the experiment is complete each piece of potato shall be dried and then re - weighed, and the new weight recorded. All in all I will have 4 weights for each concentration (2 weights per test tube, 2 test tubes for each concentration labelled A and B), one weight for test tube A before experiment, and one weight for test tube B before experiment = 2 weights. Ten we will have one weight for test tube A after experiment, and one weight for test tube B after experiment = 2 weights. I will be using 20 cc of solution, here is a table showing how I will be setting up all the different concentrations: Concentration (M) Water (cc) Salt Solution (cc) 0.0 20 0 0.2 16 4 0.4 12 8 0.6 8 12 0.8 4 16 1.0 0 20 List of apparatus: Salt solution, Water, Measuring Cylinder, Size 2 borer, Knife/scalpel, Potato, Cutting tile, 12 glass test tubes, Test tube holders (Rack), Sticky labels, Electronic Weighing scales, Ruler (For measuring length of potato). ...read more.


The measuring for concentration (cc), and Mass of potato strips, were done very accurately using a measuring cylinder for the concentration and electronic scales for the mass of the potato. The measuring was done to the most accurate degree possible, the only measuring were it was maybe slightly inaccurate was the cutting of the potato strips as there was no equipment to help us measure them accurately, so we relied on the accuracy of the naked eye, and a ruler. Conclusion - Overall the experiment was completed successfully, but if we were to re do the experiment we would ask for more time. As the time scale was very small it didn't allow the group to cut sufficient amount of potato strips. Also, if I was to repeat the experiment I would make sure that all the potatoes used in the experiment were the same age, and species/brand to get a greater degree of accuracy in the experiment for better results. I could have also used a more accurate scale, which again would have provided a greater degree of accuracy for the optimum results. When pushing through the potato with the borer I could have been pushing through a hole that had already been used, which could give an inaccurate when weighing. And as we relied upon the naked eye when cutting the potato strips to length a degree of accuracy has been lost. If we were to repeat this experiment again I would try to ensure that I had the best modern technology available to get the most accurate set of results possible. ...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. Peer reviewed

    How the Mass of Plant Tissue is Affected by a Range of Water Concentrations

    5 star(s)

    I will use a cork borer and a scalpel to cut them all to a uniformed size of 5 cm. I will cut 5 of these chips as I will be taking 5 readings. I will then measure and record the mass and of each chip using a weigh machine.

  2. Peer reviewed

    Osmosis in potato and apple

    3 star(s)

    More results are needed for a solid reliable conclusion; therefore I will be using 5 chips for each concentration of salt solution, of each plant tissue. The null hypothesis is that there is no difference in water potential between apple and potato.

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

    This meant that the concentration of the water molecules was much less than that of the inside of the cell. This meant the water moved down the water gradient due to its high water potential and therefore move out of the cell and decreased its mass.

  2. Free essay

    Investigation osmosis in potato cells

    This will allow us to see whether osmosis has taken place, and to what extent. The volume of the solution that the potato chips are kept in must be fair. The must be totally covered in the solution. Risk assessment/ safety precautions: During this investigation, there are a number of

  1. Osmosis, This experiment is about how osmosis works in a potato. I am going ...

    the potato out and dry it using a paper towel Weigh the potato again and record the results Then plot a bar graph using your results Results/ table 0 0.25 0.5 1 Weight 1 Weight 2 Difference Conclusion/ Evaluation My results show that the potato chip with less salt concentration has gained mass.

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

    Apparatus: Method: 1) First of all I will cut 6 pieces of potato using a potato borer. I will use a ruler to make sure that they will all have a diameter of 5 millimetres and will have a length of 3 cm if they were not I would use

  1. Science Coursework

    21 23 21 0.0100 23 2 5 25 25 27 26 0.0400 My Graphs Analysis Looking at my graphs you can see that as the distance of the lamp from the Elodea increased so did amount of bubbles produced. Meaning that as the amount of bubbles increased the rate of photosynthesis also increased.

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

    1 core-borer (size to be used unknown as it depends on which one I can acquire)- a very good method of attaining similar samples of potato. Simply cutting bits off of a potato is vastly inferior to using a bore, because of the imperfection in my scalpel strokes making a borer more precise.

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