P6 a III) The controlled factors will be the size of the potato and the amount of salt solution used.
P6 b I) We will aim to get two different sets of results.
P6 b II) The thing that we will measure will be the weight of the chip before and after the experiment.
A6 a) The Graphs Are Already Done As Illustrated.
A6 b I) The graphs conclude that as the solution got higher the weight gained got lower and lower until it peaked at the 0.6M solution as the biggest loss in weight. I feel that the 2nd set of results were not accurate because they differ greatly from the 1st set. I think this happened due to the variation in weight at the beginning of the experiment.
A6 b II) I think that the results one, four and five of the 2nd set are odd because a lot less weight was gained on the 1st chip (In the first set of results 21.6% of the starting weight was gained while in the 2nd set only 13.5% of the starting weight was gained). Also a lot more weight was lost on the 4th chip (In the 1st of results only 5.5% of the starting weight was lost while in the 2nd set 10.9% was lost, almost double the loss of the 1st set) and the 5th chip (In the 1st set of results only 8.2% of the starting weight was lost while in the second set 13.6% of the starting weight was lost, that is roughly 1.5 times as much as the weight loss than the 1st set).
A6 b III) The 0.6 M solution made gave the chip a rubbery like texture because in the 0.6 M solution the salt absorbed all of the moisture out of the chip. The 0.4 M solution had a large effect on the chip but not as large as the 0.6 M solution. I think that the 0.3 M solution decreased but only slightly. The 0.2 M solution made the chip bulkier because the chip absorbed the water out of the solution. The 0.1 M solution had more effect than the 0.2 M solution but not as much as the effect that Distilled water had on the chip. This links into my theory as I said, “I think that the 0.6 M solution will give the chip a rubbery effect because in the 0.6 M solution the salt will absorb all of the moisture out of the chip. The 0.4 M solution will have a large effect on the chip but not as large as the 0.6 M solution. I think that the 0.3 M solution will be balanced so the chip will stay as it is. The 0.2 M solution will make the chip bulkier because the chip will absorb the water out of the solution. The 0.1 M solution will have more effect than the 0.2 M solution but not as much as the effect that Distilled water will have on the chip because distilled water has no salt strength, this means that none of the cells will shrink however they will grow in size causing them to gain weight”.
E6 a I) I do think that the evidence is reliable because there is only the odd chip that has a totally different result in the two sets of results so that leads me to believe that the results that I got are pretty reliable.
E6 a II) I think that there is some odd results because we did not get the exact same weights and lengths of the chip.
E6 b) There are many ways that I could improve this experiment, for example I could have used pre cut chips that were the same length as well as checking that they weighed the same and I could also widened my result by using extra strengths of solution such as 0.5M and 0.7 – 1.0M solutions (These would go up by 0.1 in strength each time).
- The cell is in a normal state.
- Water is starting to enter the cell an outstanding rate from the outsize.
- The Vacuole starts to push towards the sides causing the cell to gain weight and grow in size.
I expect this to happen in the test tubes, which contain Distilled Water, 0.1M and 0.2M salt solutions because osmosis will allow extra water to enter without the salt causing water loss -> gain in weight.
- The cell is put into the salt solution.
- The Salt Solution makes all parts of the cell shrink.
- The effect is that the cytoplasm starts to tear away from the cell wall causing the cell to shrink even further reducing its weight.
I expect this to happen in 0.3M, 0.4M and 0.6M strength salt solutions because osmosis will let in the salt solutions but this will cause water loss -> loss in weight.