Consequently, I predict that the potato slices in the higher sugar concentration solution that the opposite will happen, water will move out of the stomatal pore, this will make the potato slices loss weight. This is because water will move from a region of high concentration (the potato) to a region of lower sugar concentration (the solution) through a semi permable layer (the lower epidermis, the stomatal pore) by using turgor pressure to push the water out.
Results table
Pilot experiment
Experiment 1
Experiment2
Averages table
Analysis
Looking at the first experiment 5% to 10% sugar solution shows a decrease in mass 3.7g to 2.5 this is a difference of 1.2g over the one day in there different solutions. Which is a large decrease in mass, when looking at the graph you can tell the rate of weight loss starts out slow;
then suddenly becomes almost linear indicating rapid weight loss.
Then towards the end gradually coming to plateau. Comparing gradients this confirms this. The gradient for the 5% difference in concentration of the solution is -27.16g/5% of solution. This confirms there was a large drop in mass between the different solutions. This maybe proving where most of the reverse in osmosis happened, meaning at some where between 10-15%most of the water escaped out from the stomatal pore into a higher concentration (in the potato slices) into a region of lower concentration the potato uses turgor pressure and pushes the water out into the solution this is why there is a significant decrease in mass.
Looking at 10-15% concentration solution in experiment 2 there is also a significant decrease in mass was 3.5g to 2.2 this is a difference of 1.3g which is 0.1g more than the first experiment. When comparing to the graph which is curved but in the middle almost linear at the same place as the last experiment pointing towards that reverse osmosis happens near this point; 10%. Comparing to the gradient confirms that more weight was lost. The gradient for the 5% difference between 10-15% concentration is -33.0g/5% of solution. This definitely confirms significant decrease in mass. In experiment two 5.84g more is lost in the potato’s inferring that more water is lost and therefore backs up my idea that reverse osmosis happens around 10% in the experiment.
Between 5-10% in the second experiment no weight was lost, this could have been for a variety of reasons. While pouring solutions one of the solutions might have been contaminated with another, this could have occurred because the measuring cylinder was not washed out filled up before pouring measuring out another solution.
Looking at the averages graph one can see there is a non- linear relationship on the line of best fit. The line of best fit is more curved on the averages graph. At the start of the averages graph there is a slower less steep curve indicating a slow, lesser decrease in weight between these points (5-10%) When looking at the gradient for this pint this is confirmed. Only –3.6g/5% of solution was lost between 5-10% in the experiment. This indicates that between these two points (5-10%) there was not a lot of difference in the accumulation of concentration of sugar in the solution. Between 10-15% there is almost a sudden linear relationship, there was hardly no curve. This suggests a lot of weight was lost between the two points. When comparing this to the gradients it proves that the most weight was lost between 10-15% and not between 5-10%. –37.29g/5% of solution was lost between these points confirming that a lot of weight was lost and backs up evidence on my theory that most weight will be lost on the higher side of 10% but no higher than 15% concentration of sugar.
At the end of 15% the graph begins to plateau the line of best fit begins to plateau out. This can be proved when looking at the gradient for the very last and highest percentages of solution. Between 15-25% of solution the gradient is –7.5g/10% of solution. When comparing this to the final solutions it is clear to tell that osmosis in the potato plant is beginning to slow down. Between points 25-35% on the graph the gradient is
-7.6g/10% of solution that indicates that at these points osmosis in the potato plants is slowing down; there is only a small difference between weights that is 0.1g, which implies that the rate of weight loss is coming to a plateau.
Evaluation
My results I think are reliable, when looking at the results table all results are similar and do not differ by large amounts, except one that occurred in the second experiment between 5-10% sugar concentration solution. While collecting the results I noticed that between these points no weight was lost or gained. I found this odd as I took care while measuring, cutting and weighing the potato’s in the experiment. This led me to think that the measuring cylinder must have been contaminated while measuring out the solutions, or that one of the sets of potato’s must have not been dabbed dry my paper towel. Either one of these suggestions could have led to getting a odd result, but apart from this no other odd patterns were noticed while looking at the experiment.
My results have given me a clear view and patterns that can easily be used to make a good conclusion.
My method is a good one, thee method could have done with more detail when referring to the apparatus. But other wise my method is simple and detailed and also importantly easy to follow.
To extend my experiment to get more evidence for my conclusion I could always repeat the experiment over and over again this would allow me to collect more accurate more convincing results. The experiment could have also been done more fairly and accurately by repeating exactly the process by which I did each experiment this would give me fairer more accurate results leading to a better and more precise conclusion.
Conclusion
From my results I have find out that ‘ the higher the concentration of sugar in potato’s, the lower the mass becomes’ and vice versa.
I have also proven my predication right. I predicted that the lower the percent of sugar in the solution the heavier the slices or total mass will become. This has been proven right my results I have gathered from the experiment, the potato began to lose weight as the solution percentage rose. This is because water has passed from a region of low sugar concentration to a region of higher concentration through the stomata.
I also said I my prediction that the opposite would happen, that as soon as the percentage of sugar in the solution rose above 10 or 15% that the potato slices would lose weight. This is because the stomata has lost turgor pressure and has let water out through the pore. The water has moved in the reverse, water has moved from a region of high concentration to a region of lower concentration through the stomatal pore. Therefore the potatoes have lost weight.
Looking at the results tables proves this, that ‘ the higher the percentage of sugar in the solution, the lower the mass becomes.
