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To find out if concentration affects the rate of diffusion.

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Introduction

Amber Vijayaratnam Tuesday 1st February 05 Investigation Aim: To find out if concentration affects the rate of diffusion. Prediction: I predict that the higher the concentration of acid the faster the reaction will be. Hypothesis: Diffusion is the spreading out of a gas or liquid from an area of low concentration to another area where it has a lower concentration until the overall concentrations are balanced. The Hydrochloric acid (HCl) diffuses into the gelatine cube of which contains Sodium Hydroxide (NaOH), which is an alkali. When the Hydrochloric acid combines with the Sodium Hydroxide they form salt and water, which is neutral therefore turning the pink cube to clear. Dependent variable: We are measuring the time taken for the pink indicator to turn clear when hydrochloric acid is added to it. Independent variable: We are changing the molar of hydrochloric acid we are adding to the gelatine cubes. ...read more.

Middle

for is accurate * Ensure that the acid is measured out to exactly 10mls each time to keep it fair * Use the same equipment each time so there are no variations Safety: To make sure that this experiment is safe you should wear safety goggles so as not get and HCl into your eyes at it is highly corrosive and irritant. You should also tuck your tie into your shirt so that it does not hang into the HCl or any other part of the equipment or apparatus. Make sure you have a clear working area so that no accidents occur whilst you are conducting your investigation. There is no Bunsen burner or any other dangerous equipment in involved in this investigation apart form the HCl therefore there are not many safety precautions. Results Table: Molar of HCl 1 (mins) 2(mins) 3(mins) Average: 3 10.04 10.17 9.36 9.86 2.5 10.28 10.29 10.30 10.29 2 10.20 9.22 9.50 9.64 1.5 7.29 7.15 5.59 6.68 1 5.39 6.27 5.43 5.70 Conclusion: As you can see my results are very different to what I have predicted. ...read more.

Conclusion

I am fairly confused about the results that we have ended up with but I think that they may have turned out this way because one, we had to conduct the investigation over a period of two days as each of the 15 goes took up to 10 minutes and we needed clearing away and preparation time. Therefore we had to use several different pieces of equipment maybe this had an effect on the unusual results. The first day of the investigation the cubes had been placed in a fridge overnight and on the second day this hadn't been done which I think had the biggest effect on our results. If I were to conduct the investigation again I would have liked to have gotten some more usual results and be more in line with my prediction. This is the first time my results have been this unreliable and unusual and next time I will ensure that I follow everything exactly to ensure the results are good and reliable. Graph: Amber V ...read more.

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