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I am going to investigate the procedure of osmosis by placing slices of potato in water with different volumes of sugar.

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Introduction

PLANNING I am going to investigate the procedure of osmosis by placing slices of potato in water with different volumes of sugar. The variables I used in my investigation are the sugar content in the water, the length, and the weight of the potato slices. I hope to collect the weights and lengths of the potatoes at the end of the investigation as my variable. For this experiment, I will be using test tubes for the water solutions and potato slices. To keep these test tubes safe, I will keep them in a test tube rack. I will have to use a ruler to measure the lengths of the potato slices. I will also be using a set of electronic scales to weigh the potato slices before and after the experiment. I will need to get accurate results, so I will double-check all the variables before and after the experiments. I predict that the results of my experiment will be that the less sugar content of the solution, the bigger the weight and size of the potato slice. ...read more.

Middle

Here is my results table... Content of test tube Top / Bottom Weight of potato Length of potato H2o Top 2.1 g 3.8 cm Bottom 2.0 g 3.7 cm 0.2 Top 1.8 g 3.5 cm Bottom 1.7 g 3.5 cm 0.4 Top 1.48 g 3 cm Bottom 1.43 g 3 cm 0.6 Top 1.37 g 3 cm Bottom 1.33 g 3 cm 0.8 Top 1.29 g 3 cm Bottom 1.12 g 3 cm 1.0 Top 1.11 g 2.6 cm Bottom 1.1 g 2.6 cm I repeated this exercise, because I thought my lengths were a bit odd, as a lot of them came out as 3 cm. Here is my second results table... Content of test tube Top / Bottom Weight of potato Length of potato H2o Top 2.21 g 3.8 cm Bottom 2.06 g 3.7 cm 0.2 Top 1.84 g 3.5 cm Bottom 1.63 g 3.5 cm 0.4 Top 1.46 g 3.3 cm Bottom 1.43 g 3.3 cm 0.6 Top 1.37 g 3.2 cm Bottom 1.32 g 3.1 cm 0.8 Top 1.23 g 3.1 cm Bottom ...read more.

Conclusion

The second time around, the results were much better, and I found that I was pleased with them. If I were to do this experiment again, I would try to improve the test by making it a bit fairer. For example, while preparing for the experiment, I would try and make sure that all the weights of the potatoes were the same, as well as the lengths. I was unhappy with my first results, as I thought that they did not give enough evidence to prove my prediction right. I performed the experiment again, and found that I had sufficient evidence to support the conclusion that I had predicted correctly. If I wanted to further prove myself, I could do another experiment, with a wider range of variables and solutions. I could also have made the test fairer, as I have mentioned above. In conclusion, I would like to say that my prediction was correct, but I could have given it a bit more detail, such as explaining what would happen with the higher concentrations of sugar as well as the lower concentrations ...read more.

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