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This graph shown above gives the line of best fit for the percentage change in mass of the potato chips over the course of the thirty minute experiment The graph is a curve that slopes downwards and does not go through the origin Because the line is not straight and does not pass through the origin it means that the percentage gain and loss in mass and concentration are not directly proportional However there is a pattern on my graph and this is as the concentration of the solution increases the percentage change in mass decreases The graph shows that the percentage gain and loss in inversely proportional to the concentration The gradient does change in my graph It gets less steep as X axis gets bigger This is because the potato chip is becoming as flaccid as it possibly can and so the change in mass of each molar concentration is becoming closer and closer together From the line of best fit that has been added in it can be seen that all of my points were very close to creating a perfectly smooth curve This shows that my results are fairly reliable My graph fits in with my prediction of the experiment graph It shows that the potato cells increase in mass in solutions with a high water concentration and decrease in mass in solutions with a low water concentration When the concentration reaches above 075 M there appears to be no further water loss suggesting that the cell is fully plasmolysed From the graph an estimate to the concentration of the potato cell can be made as 013 M as this is the point where the potato is not increasing or decreasing in mass this is known as the isotonic point This is where no osmosis is taking place both the potato and the solution have an identical molar concentration The next point 025 M looses approximately 40 This
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