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An Investigation to Find the Concentration of a Potato Cell Sap

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Introduction

An Investigation to Find the Concentration of a Potato Cell Sap Definition Osmosis is the movement of water from a weaker/more dilute solution, to a stronger/more concentrated solution through a selectively permiable membrane. We desplayed what will happen using a model cell experiment in which we subsituted visking tubing bags for cells. We placed glucose in one cell and water in the other. We then placed the cell filled with glucose in a test tube filled with water and placed the cell filled with water in a test tube filled with glucose. The results of this experiment showed that the cell filled with water lost weight and the cell filled with glucose gained weight therefore prooving the definition. Prediction I predict from a preliminary experiment that the concentration of the cell sap is 0.3 Molar. In the preliminary experiment we prepared three concentrationss: 0 Molar, 0.5 Molar and 1 Molar, and three potato chips all the same length. ...read more.

Middle

To be accurate, we will record the mass change in percentage and to calculate this we will use the equation: %change = (change in mass/original mass) x 100 Apparatus Method We are going to use potatoes to conduct our experiment because they are still living and have cell membranes. We will use 0.2, 0.3, 0.4, 0.5 and 0.6 Molar solutions of distilled water and glucose. We will measure the different Molar concentrations out by using a pippette, a measuring tube and a beaker. We will use the distilled water to make sure that it is a fair test and that the only thing dissolved in the water is glucose. We will cut five potato chips to excatly the same length, measure and weigh them, and drop them into the solution at exactly the same time. After 30 minutes we will take out the chips, dry any excess liquid off them, and reweigh and measure them. Analysation and Conclusion First Experiment Results Mass/g Length/mm Solution/M Original New Change %Change Original New Change Texture 0.2 3.27 3.35 0.08 ...read more.

Conclusion

But, there is a pattern in the opposite direction going in an inversely proportional way which means that as the concentration of the solution increases, the percentage change in mass decreases. My graph shows that there was an overall decrease in mass during the experiment. Evaluation My results were quite accurate but it was hard because the Molar solutions were hard to measure out as they were so tiny also we did the two experiments on different days so the teperature in the lab could have changed which would mean that one of them would work faster than the other. We didn't have any anomalous results which was good. Next time I did this experiment, I would change the length of time the potato chips were in the solution - I would work quicker at the beginning of the lesson to try and give them about 45 minutes in the solution. The results we got were enough to support a firm conclusion because we did a wide range and then we did a very narrow range which was more accurate. ?? ?? ?? ?? Claire Auchivole 10T ...read more.

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