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Investigating Surface Area to Volume Ratio concerning the rate of Diffusion

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Investigating Surface Area to Volume Ratio concerning the rate of Diffusion Aim: To determine the relationship between Surface Area and Volume Ratio of a phenolphthalein impregnated agar block, and the rate of diffusion into the block. Description: Diffusion is the passive movement of particles from high concentration to low concentration. It is a very slow process so therefore the smaller the cell it is more efficient and faster. Hypothesis: As the volume of the agar block decreases, the rate of diffusion will increase because the speed of the molecules (movement) is directly associated to the volume. Equipment: - Agar - Sodium hydroxide () solution - Knife - Beaker - Ruler - Stopwatch Variables: Manipulated Variable (MV): volume of the agar cubes. Responding Variable (RV): rate of diffusion and percentage of diffusion. Constant Variable (CV): time, stopwatch, ruler, same bottle of . ...read more.


1 0.70 1.00 0.60 0.76cm 8 0.10 0.20 0.40 0.23cm 18 0.05 0.07 0.08 0.07cm Weighing the amount of present and the amount of agar remaining: Volume of Agar Cube Agar Weight of Cube (g) 1 0.12g 1.59g 1.71g 8 3.45g 4.27g 7.72g 18 6.46g 7.65g 14.11g 32 14.28g 9.27g 23.55g Results: To calculate the percentage of each cube when measuring with a ruler, follow this procedure: 1cm 1cm 1cm Volume of Agar Cube Percentage of present 1 3.8% 8 21.74% 18 71.43% Data Representation: (Graph of above data on sheet attached). Row Mass absorbed (g) Original Volume = Mass % absorbed SA (cm�) Volume (cm�) SA/Vol (cm) 1 1.59 1.71 0.930 6 1 6.0 2 4.27 7.72 0.553 24 8 3.0 3 7.65 14.10 0.542 42 18 2.3 4 9.27 23.60 0.394 64 32 2.0 Conclusion: In conclusion, we tested the Surface Area to Volume ratio in two different ways because we could not decide on which method would be more accurate. ...read more.


We were not able to make all the cubes have the same length, height and depth because the agar was only a certain depth. Although three trials were taken for each agar cube, I still believe that the source of error might have been largely affected by this measurement therefore; we used two methods of finding the percentage of present in the agar cube. We did not make sure that the had a constant temperature so this could have been another factor which affected our experiment. This experiment could be improved by having accurately cut agar cubes as well as another possible way of measuring the absorption of sodium hydroxide. One potential method could be using a jelly mould in order to make sure that all the cubes are the same size and this would make the experiment more accurate. Some of our data was collected during another time and mould started growing on the agar so possibly the experiment was affected by this. ...read more.

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