• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15

Title: An investigation into the affect of different concentration salt solutions on potato tissue

Extracts from this document...

Introduction

BIOLOGY COURSEWORK MRS HANDA DAMANJIT KAUR KHAKH 10 ORANGE Title: An investigation into the affect of different concentration salt solutions on potato tissue Aim: .I have to find out the effect of varying salt concentrations on a potato tissue. Also to find out how osmosis occurs with different salt concentrations from very dilute to very concentrated. I will be looking for any changes in mass and length Prediction: I predict that the most concentrated salt solution (1 molar) will be the solution that will have the most dramatic effect upon the tissue of the potato. As the solution goes down the line in other words gets more and more dilute or weaker it will have a less distinctive effect upon the potato tissue. This will happen due to the high concentrated solution i.e. the 1 molar salt solution moving across into a low concentrated are i.e. the potato chip. The potato chips that are in the most concentrated solutions will be the ones, which will lose mass. The potato chips which will be in the diluted solutions will gain more mass this is the actual osmosis scientific theory. Osmosis is the movement of water molecules from an area of high water concentration through a semi-permeable membrane to an area of low water concentration. This is very similar to diffusion and active transport. Osmosis Theory Solution A Solution B Partially Permeable Membrane Key = Solute Molecules = Solvent Molecules Preliminary Experiments: Visking Tubing Experiment Visking Tubing This is a thin plastic with microscopic holes, which allow small molecules to pass through Aim To observe the process of osmosis in an experiment Apparatus * 2 Beakers filled with sodium chloride of different concentrations * 2 Visking tubes filled with water * Elastic Band Diagram 0.8 solutions Beaker O.2 solution Visking Tubes Method 1. Tie one end of a Visking tube with a rubber band tightly 2. ...read more.

Middle

After I have measured it I will pour it into my beaker, which contains the 40cm3 of salt solution. I will have to label it 4. The fourth solution I will be making will be 30cm3 of 1 molar salt solution .I will measure it in the salt measuring cylinder and check it at eye level. Then I will pour it into the fourth beaker. Then I will get the water measuring cylinder and measure out 20cm3 of distilled water I will then check it at eye level. Then I will pour it into the beaker, which contains 40cm3 of salt solution. I will then label it. 5. The fifth solution I will be making will be 20cm3 of 1 molar salt solution. I will measure it in the salt measuring cylinder and check it at eye level. Then I will pour it into the fifth 100ml beaker. Then I will measure 30cm3 of distilled water in the water-measuring cylinder. Then I will check it at eye level and pour it into the beaker containing the 20cm3 salt solution. Then I will need to label it 6. The sixth and final solution will consist of 10cm3 of 1 molar salt solution. I will measure this in the salt measuring cylinder and check it at eye level. Then I will pour it into the sixth beaker. I will then measure 40cm3 of distilled water in the water-measuring cylinder and check it at eye level. I will then pour this into the beaker along with the 40cm3 salt solution. 7. Next I will need to prepare 18 potato discs/chips each of the length 10mm.I will obtain 18 out of 1 potato need 18 as I will be placing three discs in each test tube for more varied and reliable results. I will not wash it or peel it will need the white tile a scalpel a pencil a ruler and a weighing scale. ...read more.

Conclusion

As I did have a detailed method to help me can prove it had no problems and it is a good method because my results and graph was accurate. I think this result occurred due to me trying to get excess water of the potato by using blotting paper. You can't really measure if you have got all the excess water off and you are using the paper equally. This anomalous result could have been prevented if I didn't use blotting paper at all but this would have still had some side effects towards my results. Another area, which I could of, improved would have been the time period as I only left my chips in the solutions for 12 hours. I didn't really know that osmosis had fully taken place. However if I had left them for 24 hours then I would be assured that osmosis had fully taken place and my results would be precise and consistent. The last thing I would improve would be to develop the variety of concentrations I used for this experiment. If I had 12-14 created solutions instead of 10 then my results would have been accurate. From this I would receive better and more results for my graph and my line of best fit would be correct and accurate. Instead of a potato tissue I could of used an onion cell or a fruit cell such as an orange. Then After I completed both experiments and shaped graphs for them I could evaluate them and I could see if the process was similar or diverse. I think my results drawn were reliable. There were a good variety of results taken. But they didn't vary drastically. This shows me that my results were accurate. Also as I received an anomalous result I think that tells me that my results were accurate In general I think my experiment went quite well and was planned correctly by myself. The results I produced from this experiment were accurate as they backed up and justified my prediction. Diagram Damanjit Khakh 10 Orange 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 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. Marked by a teacher

    An experiment to investigate how the effect of varying concentrations of salt solutions play ...

    4 star(s)

    FAIR TEST To make this experiment a fair test : > The potato cylinders should be the same size. This is because if one potato sample is 2cm long and one is 4cm long then the 4cm long sample will have a larger surface area and the rate of osmosis would be much quicker.

  2. Marked by a teacher

    Investigation Osmosis in Potato Tissue

    4 star(s)

    The volume of the solution will increase greatly and so will the angle of turgidity. This is because: Experimental Procedure The key factor that I plan to investigate is sucrose concentration, and I will vary the sucrose concentration, and calculate the effects of this factor on osmosis in the potato

  1. The endeavour of this investigation is to ascertain if there is any effect of ...

    So by using potato pieces of this shape I will acquire results, which cover a larger range and will be able to get the most accurate reading of the sucrose solution of the potato tissue. The sucrose solution at which the mass of the potato did not change was in

  2. Lab Research Paper. Just a Pinch of Salt and a Dash of Bacteria: the ...

    The Agricultural and Rural Development Section of the Government of Alberta (2001) did a study on the correlation between the salinity of soil and common plants in the area. They found that the vegetation that could endure higher concentrations of saline soil were mostly from the genus Puccinellia such as the fults alkali grass and the levonns alkali grass.

  1. Osmosis investigation

    The scales I used were sensitive enough to be able to detect changes of 2 decimal points, which increased precision and accuracy of results. 4. By getting repeated measurements (the 3 different chips) I reduced the effects of random errors because I made an average of the 3. 5.

  2. Investigate the osmosis in Potato rods when they are put in different Concentrations of ...

    I will prepare the 5 test tubes and put them on the holder. I will label the 5 test tubes according to the concentrations of the salt solutions I will use, I will label any test tube the number 0.0 and I will pick another test tube and label

  1. Osmosis is defined as 'the movement of water molecules from an area of high ...

    0.10m, 1.15m, 1.20m, etc. This way I could have found the isotonic point by there being no change in mass. This would show the water potential of the potato , and this result could then be used further. Also to make my experiment better I could have repeated it more,

  2. An investigation into osmosis in potato tissue.

    the potato tissue as a result of their immersion in the solutions: 1) Measure the change in length of the potato cylinders. This has several disadvantages with regard to potential inaccuracies in measurement: firstly it would only measure the change in length of the chip and would not take into account the change in diameter.

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