The Effect of Glucose Concentration on the Rate of Osmosis - page 10
Keywords: Osmosis, potatoe, biology, GCSE, rate of osmosis, rate of reation, Glucose Concentration on the Rate of Osmosis
By abdul on 20/11/2006 17:20:23
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 10 of 10 pages: 1 2 3 4 5 6 7 8 9 10the diluting water. Another possible reason could be the affect of temperature on the rate of osmosis, because as we know temperature affects the rate of osmosis by speeding up the molecules which will decrease the time needed for a certain length or mass to be reached. However there are still some experimental errors which can be identified by looking on the graphs. Graph 2 is more precise and accurate than graph one, as graph 2 have nearly a straight line and I think this is because in the first method (mass) it was very hard to maintain accuracy due to excess water on the potato chip and between its cells, while in the second method (length) it was easier to obtain more precise and accurate results because the change was obvious and can be measured easily by ruler.
According to my evidences my conclusion, which is that as the concentration increases the rate of osmosis increase and as the concentration gets higher the potato chips will lose more mass and length, is right and a good prove is that I have repeated the experiment three times; also I have repeated the anomalies which did not fit in pattern with the rest of results in order to get the reliable and precise results. And by repeating the anomalies I have got a very precise and accurate mean that helped me to plot precise points in my graphs.
Also I wished to extend it more and to see how changing other factors such as the temperature and surface area can change the rate of osmosis, also I wanted to experiment how concentration can affect the rate of osmosis of apple and then compare the thickness of the potato’s cell wall and the apple’s cell wall. But unfortunately I did not have enough time.
Done By Abdul
Bibliography
• GCSE Science Class Book – By David Baylis, Graham Booth and Bob McDuell.
• GCSE Biology third edition – By D. G. Mackean.
• Exchange and Transport, Energy and Ecosystems – Nelson Advanced Science (NAS) – Revised Edition – By John Adds, Erica Larkcom and Ruth Miller.
• Focus Educational Software, Science investigations2.
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