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The aim of our experiment is to see how osmosis affects the shape or mass of the potatoes.

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Introduction

Osmosis Experiment Osmosis is the diffusion of water from a dilute concentration to a more concentrated solution. In all things, everything moves from high concentration areas to low concentration areas, when in water, this process is called 'Osmosis'. With potato (plant) cells, it swells up as water enters through osmosis, however, it won't burst because the cell wall is tough, and it only stretches out slightly. Aim: The aim of our experiment is to see how osmosis affects the shape or mass of the potatoes. Method: We cut up some potato with a cork borer and put 5 bits in salt solutions and 1 in a beaker of water. ...read more.

Middle

To make it a fair test we made sure we used the same amount of water in each beaker and put the potatoes in at the same time. All the bits from the same potato we put cling film over the top so the water would not evaporate, making the test unfair. Results: Experiment 1 Solution Weight Before Weight After Percentage change 1% 1.90g 2.06g +8.42 % 2% 1.92g 1.69g -11.97 % 3% 1.96g 1.61g -17.85 % 4% 1.84g 1.62g -11.95 % 5% 1.50g 1.56g +4 % Water 1.58g 2.78g +75.9 % Solution Weight Before Weight After Percentage change 1% 1.52g 1.72g +13.1 % 2% 1.76g 1.49g -15.34 % 3% 1.80g 1.52g ...read more.

Conclusion

In the 2nd experiment, as the concentration go higher, the mass of the potatoes got lower. The graph looks more like a graph with a sigmoid curve in but still, it is not exactly right, even though I did everything to make it a fair test and get the most accurate results. My prediction is half correct. In some cases it is correct because the concentration is higher and the mass of the potato is lower, but in other cases the mass of the potato gets higher, which I did not predict. For example, on the 1st experiment at 2 and 4 concentrations the mass of the potato goes up and the same happens on the 2nd experiment at the 6% concentration. ...read more.

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