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The aim in this investigation is to find out how different concentrations of sugar solution will affect the size of potato cells.

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Introduction

Osmosis experiment Adam Bowen Aim The aim in this investigation is to find out how different concentrations of sugar solution will affect the size of potato cells. Prediction My prediction is that when the potato is in the pure water the potato will swell. If sugar is dissolved in the water the potato will shrink. This prediction is based on a scientific theory called osmosis. Osmosis is the movement of water molecules across a partially permeable membrane from a region of high water concentration to a region of low water concentration. If a potato chip is surrounded by water, the water particles will naturally diffuse into the potato chip, by osmosis, making the potato chip bigger. If there is a rich sugar solution surrounding the potato chip, the water particles in the potato will naturally diffuse out of the potato chip, by osmosis, making the potato chip smaller. ...read more.

Middle

The experiment was timed for 20 minutes. The test was then repeated. The changes in length of the chips were recorded. Safety Ensuring an adequate safe working area is necessary when using a scalpel and the glass beakers. Planning Variables that are going to stay the same Measuring cylinder Ruler Volume of solution Time of chips in solution Temperature Variables that are going to change The concentration of the sugar solution The measuring conical and the ruler are going to stay the same, because this type of equipment is mass-produced. It would be inaccurate to use different rulers and measuring conicals each time the test is done, during the experiment. The concentration of sugar solution is going to change so the prediction can be proved or disproved. Results solution length at start length after 20 mins change in length average (Molars) (Millimetres) (Millimetres) ...read more.

Conclusion

If there is a rich sugar solution surrounding the potato chip, the water particles in the potato will naturally diffuse out of the potato chip, by osmosis, making the potato chip smaller. If the concentration of water in the potato chip is the same as the concentration of water outside of the potato chip, there will be no change in length; this is called the isotonic point of concentration. There was an isotonic point of concentration shown on the graph, which further backed up the prediction. Evaluation Although the results and graph proved that the prediction was correct, there were lots of ways that the experiment could have been improved; a more constant temperature in the room (temperature controlled room), more readings at longer timed intervals, and a bigger potato chip size. All these things would have made the experiment more accurate. ...read more.

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