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Investigating surface area to volume ratio on the rate of diffusion into gelatine cube

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Introduction

Michael Daniel Investigating surface area to volume ratio on the rate of diffusion into gelatine cube Evaluation I predicted that the smaller the cube or larger the surface area to volume ratio the faster the diffusion rate. I was correct, so I am happy with what I have predicted. Although my prediction was correct, I did not think that there would be a pattern. This is clear in the graph. However, there is one anomalous result. This anomalous result does not fit in with the pattern, all the plots widen and drop-the anomalous result does not drop that much. The anomalous result is the largest cube [cube f] and is the first plot. If you look at the graph closely at the graph, at the top you would see the anomalous result. The anomalous result is the largest cube, we timed the rate of diffusion for the smaller cubes first. So by the time we timed cube F, the concentration of Hydrochloric acid would be weaker then at the start. ...read more.

Middle

However, if combined they could. The concentration of alkaline is another variable that can be controlled. This is because the alkaline adds to the phenolphthalein, giving it a pink color. As we are using the acid to diffuse into the gelatine, the acid has to diffuse also/pas through the alkaline. If the alkaline is at a higher concentration, maybe it would be harder for the acid to diffuse. The alkaline is unchanged, so a weak acid [after diffusing into all the other cubes] diffusing into the gelatine plus the alkaline, may do so at a slower rate. This is a problem, which can be helped. The temperature is also a variable. We did not measure the temperature or in any way changed it, instead we done the experiment at room temperature. The room temperature is not likely to change that much, but if it did it would affect the results. This is because the temperature is thermal energy, which when it comes in contact with the gelatine will change into kinetic energy. ...read more.

Conclusion

[More or less molecules in a fixed volume, which leads to either speeding or slowing, slowing if others are faster] Another improvement, which could eliminate anomalous results, would be to cut the gelatine from the same mould. This would make the pH level for all gelatine cubes the same, therefore having the same concentration. This would mean the cubes would be diffused at the same rate. Also if we place the beaker containing the gelatine cube and acid in a waterbath, we could control the temperature. We would measure the temperature of water using a thermometer, so all diffusions would be carried out at the same temperature. This would stop extra thermal energy [extra meaning room temperature higher than gelatine and acid] being transferred into kinetic energy, which would speed up the experiment. It would speed up the experiment because the molecules would collide more, diffusing at a greater rate. All these improvements would not make that much of a difference, but we have a anomalous result so they are worth doing. We could investigate surface area to volume ratio at a deeper level. ...read more.

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