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

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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.

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