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OSMOSIS

My aim for this experiment is to see the results of a potato tissue''s mass difference, when placed in different concentrations of sugar solutions.

Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. In this case, the tiny holes in the membrane of the potatoes will allow the water molecules to pass through in and out of the solution and the potato, depending on the concentration gradient of the two substances. So in this case, when the water concentration is lower in the tissue, the later will go inside the tissue of the potato, and the potato will gain mass. If there is very little different in the two water concentrations, there shouldn''t be such a big change in mass. Also if there is a higher concentration of water in the potato, then the water will go out of the potato and into the liquid solution, as osmosis is the movement of water molecules from a region of high concentration to a region of low concentration, through a partially permeable membrane.

Prediction

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I predict that the weaker the solution is, the more solution the potato will absorb and the stronger the sugar solution the more water the potato will lose. Therefore, the weight of the potato at the end of the experiment will increase most in distilled water and decrease most in the strongest sugar solution.

Apparatus

Potato

Scalpel

Tweezers

Test tube rack

5 test tubes

Cork borer

Ruler

Scales

Sugar solutions

Method

1) Using the cork borer take six samples of potato from the same potato. Then using the scalpel cut the pieces of potato so they are twenty millimetres long. Remember to weigh the potato pieces and record their weight in a table.

) Take six test tubes and place them in a rack, then add the different sugar solutions. These are sugar solutions, 10%, 0%, 0%, 40% and 50% and one test tube filled with water.

) Place the potato pieces in the test tubes; make sure they are covered with solution. Leave them there for thirty minutes.

4) Take the potato pieces out carefully and measure their length and weight, record this in your table and repeat twice more.

Key Factor

The key factor in my experiment is the concentration of the sugar sulution ranging from 10% to 50% I also used distilled water. I think that this is a suitable range of concentrations. The factors that I will control are the points in my fair test.

Fair test

To make this experiment a fair test I will use the same……

·ᦨ Length potatoes- so that there is the same length of potato for osmosis to take place in.

·ᦨ Room temperature- so that this doesn''t affect the rate of reaction.

·ᦨ Size cork borer- so that the size of the potato doesn''t vary.

·ᦨ Amount of sugar water- so that the potato pieces have no more or less sugar solution to absorb.

·ᦨ Amount of time potatoes are left in sugar solution. - so that I can record accurate results.

Results

Set 1

Concentration of sugar solution Length

Before Length

After Weight

Before Weight

After Difference

In weight

Distilled 0 mm mm 1.16 g 1. g +0.7 g

10% 0 mm mm 1.15 g 1.17 g +0. g

0% 0 mm 0 mm 1.11 g 1.05 g -0.6 g

0% 0 mm 0 mm 1.1 g 1.0 g -0.10 g

40% 0 mm 1 mm 1.1 g 1.05 g -0.14 g

50% 0 mm 0 mm 1.16 g 0.7 g -0.1 g

Set

Concentration Length

Before Length

After Weight

Before Weight

After Difference

In weight

Distilled 0 mm mm 1.77 g 1.85 g +0.8 g

10% 0 mm 1 mm 1.71 g 1.74 g +0. g

0% 0 mm 0 mm 1.6 g 1.58 g -0.5 g

0% 0 mm 0 mm 1.85 g 1.74 g -0.11 g

40% 0 mm 0 mm 1.81 g 1.68 g -0.1 g

50% 0 mm 1 mm 1.4 g 1.7 g -0.1 g

Conclusion

The evidence obtained from this investigation supports the prediction I made. It also shows that the potato cells increase mass in solutions with a high water concentration and decrease in mass in solutions with a low water concentration. I have been able to identify a pattern in my results, in the difference in weight.

In this experiment, I believe that I have collected enough data to support my hypothesis. This investigation was, I think, successful. Successful meaning my results collaborated my predictions. The potato cells, working to stay alive, took in, or gave out the water depending on the concentration of the tissue and the concentration of the solution it is surrounded in. I have been able to record sufficient results by repeating the experiment three times.

Evaluation

I believe we gained accurate and sufficient enough results, shown on our graph and tables that concludes the experiment, and to prove our hypothesis. My results were very reliable, due to the precautions I took to make this a fair test. I can see by looking at my graph that there is a positive correlation for each set of results.

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