Does the concentration of a solution affect osmosis? -- A* - page 9
Keywords: Biology Osmosis Concentration Sucrose solution
By georgie1 on 31/12/2009
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 9 of 10 pages: 1 2 3 4 5 6 7 8 9 10
the error bars are generally quite widespread, and do not show the range of results within the error bracket. If I was to repeat the experiment I would have calculated the standard deviation for each of the measurement to show the spread of results within the range, and therefore the error bars would be more accurate. The line of best fit for the experiment of 48 hours is a much smoother and curved line than that of the 20 minutes experiment, because of the 0.7M result in the 20 minutes experiment. The average result at this point is higher than the pattern should be which leads to me think that these all of these results should be have been repeated.
I have included all of my results in my conclusion and took the anomaly at 0.7M in the 20 minutes experiment into consideration when making generalisations. My results have covered a wide range and I feel that they support a fairly firm conclusion because they are evenly spread out throughout the range. A sufficient number of results have been collected to prove consistent/regular trends in the data. Consequently, I am confident that my conclusion is reliable.
Method
When completing my experiment, I did not experience any major problems. However, sometimes when cutting the potato the cut was not on the straight, 90˚ angle and could have gone slightly diagonally. As a result, the volume of the potato cutting would be less, which would have meant that the beginning mass would not have been accurate. However, this did not happen often and when it did, I re-cut the potato so each cutting was accurate. I am confident that all of the other factors of the experiment were controlled such as type of potato, and amount of blotting. I applied the same pressure on each potato cutting when blotting so as much excess water left the cutting as possible. I feel that I controlled the temperature of the experiment as fairly accurately as I could. However, as mentioned before, some of the test tubes may have been in the way of the flow of heated air coming from a heater, which would have resulted in an increase in temperature. I am not aware of this happening however; it could have played a small effect on the rate of the osmosis.
All of the equipment that I selected was appropriate for the investigation and I used
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