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An investigation to find out the effect osmosis has on the size of a potato cell sap in various sugar solutions

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Introduction

Ruth Talbot An investigation to find out the effect osmosis has on the size of a potato cell sap in various sugar solutions Aim My aim of this investigation is to find out the effect osmosis has on the size of a potato cell sap in various sugar solutions. To investigate this, I will put some pieces of potato in different concentrated sugar solutions and leave them for a set amount of time and measure any changes, if any, in length mass or volume. I will keep a number of things constant e.g., type and size of potato. I will repeat this investigation so I have more than one set of results. I will plot the results on a graph. Prediction Osmosis is a kind of diffusion which only occurs with water. With osmosis, there is a membrane which does not allow dissolved material to pass through it but only water (selectively permeable membrane). ...read more.

Middle

When using the cork borer you have to take care not to push it hard because you might slip and push it into your hand, the end is sharp. The dissecting needles are also very sharp. If you spill some of the solutions, it would be best to clean it up because it can be very sticky. Method 1. Take four potatoes of the same type and cut the centre out the centre of each using a cork borer. 2. Take any excess liquid off by rolling them in towel paper. 3. Cut them all to 50mm using a scalpel and find their masses. 4. Put each piece of potato into four different boiling tubes. 5. Put 20ml of 1m of sugar solution in the first 6. 20ml of 0.6m in the second 7. 20ml of 0.2m in the third 8. 20ml of water in the last 9. ...read more.

Conclusion

in this investigation I found that 20ml of water was just the right amount of solution to use. This also helped me to decide how long I would have to leave the potatos for. In this experiment I left then for 3/4 of an hour, after that time not much had changed, they hadn't really got any bigger or smaller. So I know now that I will need to leave them for longer. I am going to leave them for a week. This trial experiment didn't quite go as I predicted. There wasn't as much change as anticipated. I think this is due to the short amount of time the samples were left in the solution. Results Before Sugar Solution (20ml) Length of Potato (mm) Mass of Potato (g) 1m 50 1.94 0.6m 50 2.02 0.2m 50 2.04 Water 50 1.69 After Sugar Solution (20ml) Length of Potato (mm) Mass of Potato (g) 1m 46 1.61 0.6m 48 1.62 0.2m 50 1.98 Water 50 1.71 ...read more.

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