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Investigating the effect of salt concentration on potato tissue

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Introduction

Investigating the effect of salt concentration on potato tissue Osmosis Osmosis is the movement of water molecules from an area in which they are at a high concentration to an area in which they are at low concentration through a semi-permeable membrane. I am going to now investigate the effects of Osmosis on chips! Preliminary Experiment 1. I will firstly cut two chips all approximately the same size using a scalpel (Be careful with the scalpel) 2. Then I will pour distilled water into a test tube. 3. Then I will pour approximately the same amount of salt water into a different test tube. 4. Then I will weigh the two chips on a balance. 5. Then I will put each cheap into one of the test tubes. 6. Approximately 20 minutes later, I will take the chips out of the test tube and dry them. 7. Then I will weigh them again on a balance and note down the new weights. Results of preliminary experiment Chip Before Osmosis After Osmosis Difference 1 (pure water) 3.38 3.57 +0.19 2 (salt water) 3.39 3.15 -0.24 The results show that with pure water, the chip increases in weight whereas in a solution with a high salt concentration, the chip decreased in weight. ...read more.

Middle

3. This will be repeated two more times to make the experiment a fair test. 4. I will then weigh each of the three chips on a balance and record them into a table. 5. Then I will place each of the three chips into the three test tubes from earlier. 6. The chips will then be left for 20 minutes. This will be timed on a stop watch. 7. When 20 minutes has passed, I will take the chips out of the test tubes and dry them off. Remembering which chip came from which test tube. 8. I will then re-weigh each of the chips on a balance to try and see if any change has occurred. 9. I will then record these results into the table from earlier to see if any of the weights have changed. 10. From these results, I will draw up a graph to try and find any patterns between the sets of results. 11. Then I will write an analysis showing what the graph is telling us and to see if the results match up with my predictions. ...read more.

Conclusion

On the graph, I have marked three points. These are A, B & C. Below I will explain what happened in each of these different points. Part A: All the chips at this point are decreasing in mass. This matches with my predictions earlier on in the investigation. This is because the concentration of water outside the cell will eventually become less than the inside of the chip, because water can osmose into the chip quicker than water can osmose out of it, therefore resulting in water osmosing out of the chip resulting in mass lost from the chip. Part B All the chips at this point are decreasing in mass. This again matches my predictions from earlier on in the investigation. The mass of the chip decreases because the salt concentration is higher outside the chip than inside; therefore water will be able to osmose out through the membrane of the chip quicker than it can osmose into the chip. Part C This point is called the isotonic point. This is because the concentration outside the chip is exactly the same as the concentration on the inside of the chip therefore the mass of the chip will stay the same. ?? ?? ?? ?? ...read more.

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