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SACE - South Australian Certificate of Education

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How Does Salt Effect the Rate of Osmosis in Potato Cubes?
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How Does Salt Effect the Rate of Osmosis in Potato Cubes?

Biology

15 Pages SACE - South Australian Certificate of Education Year 12 Essay / Project Year Uploaded: 2017

For this investigation, two experiments were conducted exploring the rate of osmosis in potato cylinders. This included a validation test (experiment A) and a practical, designed by the researchers (experiment B). It was hypothesised for both experiments that as the concentration of sodium chloride (salt) increases, more water would move out of the potato cylinders resulting in a decrease in mass. To investigate this hypothesis, peeled potatoes were diced into cylinders with the dimension 2 and submerged into distilled water which was followed by different concentration of salt (0.5%, 1%, 2%, 4% and 8%). Using the initial and final masses of the cylinders, the results were recorded into a table and graphed to represent the relationship between the independent variable (concentration of salt) and the dependent variable (change in mass). For 0% and 0.5% salt solutions, the potato cylinders increased in mass. This was predicted, as these solutions were hypotonic compared to the potato cylinders. For 1%, 2%, 4% and 8% salt solutions, the potato cylinder experienced a decrease in mass. This was also predicted, as these salt solutions were hypertonic in comparison to the potato cubes. Overall, it was observed that as the concentration of the salt solution increased, more water moved out of the potato cylinders representing a negative linear trend, hence supporting the hypothesis.

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