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How do different concentrations of sucrose solution effect potato tissue.

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Introduction

Osmosis Investigation Aim How do different concentrations of sucrose solution effect potato tissue. Background Information Osmosis is the movement of water molecules though a partially permeable membrane from an area of high water potential to an area of low water potential. The membrane lets small water molecules pass though but not large ones. The flow continues until the concentration becomes the same on the inside as on the outside. This is called equilibrium. Molarity is a measure of concentration. Prediction I predict that the potato will change in mass and in length. I believe this because each Molarity of sucrose will change the potato's water content. This will happen because either the concentration will higher in the sucrose and lower in the Tubas or lower in the sucrose and higher in the Tubers. Therefore water will travel in or out of the potatoes cell though its partial permeable membrane. Apparatus list * Boiling Tubes * Sucrose solution * Stop watch * Pipette * Test Tube Rack * Distilled Water * Potato * Potato Borer * Top Pan Balance * Ruler Preliminary Method * I will firstly ...read more.

Middle

3 chips were used to create an average which gave me a better set of results and more accurate graphs. 8. Whilst waiting I set out some paper towels with which I was going to dry the tuba. 9. After 15 minutes I drained out the solutions in the sink and placed all the tubas on the paper towel in the order. I wrote on these towels which molar they came from and the test number. 10. I dried each chip with the paper towel and then placed each one on the scales so that I could weigh them. 11. Each potato was measured accurately on the electronic scales and then the weights were recorded. 12. when completing all the concentration I had got 3 results per concentration, I took an average of this result. 13. I then worked out the average % change in mass. Diagram Conclusion This graph shows the line of best fit for the percentage change in mass of the potato tubers over the course of the fifteen minute experiment. ...read more.

Conclusion

I would also increase the amount molar amounts I use, such as 0.25 and 0.75. one explanation for the bad results is when the potato chips were removed from the test tubes and dried I may well have dried some potatoes more thoroughly than others and so some would have more excess water, which would add to the mass. If the experiment was repeated I could find another way to dry the potatoes that would ensure that all were dried in the same way for the same time. I were to repeat the experiment I would have possibly found a machine to cut the potato as it would ensure that all potatoes would be the same weight and dimensions. As well as the potato I could have found a more accurate way to measure out the solutions and to determine the molar concentrations. Perhaps I could have used a burette. This would ensure that I have an accurate amount of fluid in each test tube. I could also weigh each tuber on a more accurate scale, e.g. not to 0.00g but to 0.0000g ...read more.

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Related GCSE Life Processes & Cells essays

1. The endeavour of this investigation is to ascertain if there is any effect of ...

that the amount of solution removed from the surface of the chips is constant. Reweigh the chips on the same digital balance as used before. Record the results to two decimal places, as before, in a table. This ensures uniform precision throughout the experiment, increasing the reliability of the results.

2. Osmosis Practical

This could have happened for a number of reasons. Water is lost from the potato cells into the sucrose solution because the sucrose is less dilute than the potato cell. The water travels down the osmotic gradient into the sucrose until the concentration of the cell is equal to the concentration of the sucrose solution.

1. To determine the water potential of potato tuber tissue

can read and I need my results to this accuracy, as my results tend to be changes of under 0.1g. I realised that I would needed to go to lower values of solute potential for the external solution if I was to get a proper result for the water potential of the potato tuber tissue.

2. Investigating the effect of different concentrations of sucrose solutions on potato tuber cells.

Distilled Water- The potato chips in distilled water should grow in length and should have a higher mass because there should be more water outside the potato chips than inside, therefore, water should move into the potato through osmosis causing the potato to grow in as its cells become turgid as this happened in the preliminary experiment 1.

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