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The aim of this investigation is to discover if different variables affect the rate of diffusion. My aim is to discover if the concentration of the acid affects the rate of diffusion.

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Introduction

Diffusion investigation Aim: The aim of this investigation is to discover if different variables affect the rate of diffusion. My aim is to discover if the concentration of the acid affects the rate of diffusion. Preliminary Work: For my preliminary work I looked at different types of diffusion. First I sprayed an air freshener across the classroom, it slowly diffused through the air until the smell of it was not so strong but it covered the whole room. I also set up an experiment with a glass tube which had some cotton wool soaked in ammonia placed at the end. Litmus paper was placed along the side of the tube at certain points to see how long tit took the ammonia particles to diffuse through the air in the tube. The litmus paper nearest the ammonia end turned colour quickly, it took longer further up the tube. This shows that the ammonia particles slowly diffuse through the tube, from one end to the other. From my preliminary work I can see that diffusion takes part between liquids and gases. Background on diffusion: Diffusion is the natural tendency of molecules to flow from higher concentrations to lower concentrations. Diffusion occurs quicker in hotter areas, this is because there are more collisions between the particles making them spread out more. ...read more.

Middle

in these Test tube rack - These are to hold the test tubes HCL - This stands for hydrochloric acid, the acid I will be using Water - This is to dilute the acid Measuring cylinder - I will use this to measure the volume of acid Stopwatch - This will be used to time the diffusion rate Forceps - I will use the forceps to pick up the agar Agar - Agar is the substance we will be using to see how quickly diffusion takes place. Agar is a jelly-like substance, it is orange but as acid slowly diffuses through it, it turns orange. This is a very useful property of agar as it means it is easy to spot when diffusion has finished. If the agar is touched by hands it will become heated and contaminated, it must also not be exposed to acid before the actual test. My method: Below is the method I will use to complete my investigation. * Firstly I will pour the correct amount of acid and water (using the measuring cylinder to get the amount accurate) into the test tube. water acid 0 10 2 8 4 6 6 4 8 2 * Next I will put the agar into the test tube filled with acid, using the forceps. ...read more.

Conclusion

I think the reason for this anomaly could have been that the size of the agar was not quite accurate or that the concentration of the acid was not correct. Conclusion: I can prove from my results and research that diffusion takes place quicker if the concentration of acid is higher. I therefore conclude that the lower the concentration of HCL, the time taken for diffusion to occur will be longer. The molecules moved faster the higher the concentration of acid, making more collisions. Because of this the rate of diffusion is quicker, this means that the acid diffused through the agar. Evaluation: I feel that my experiment went well though if I had had a chance I would have spent more time on it making sure my results more accurate and my practical better. I think my data was reliable because there was one anomaly, it was sufficient enough for me to draw a conclusion. To see if diffusion happens with different variables I could test: The temperature of the agar For this experiment you would change the temperature of the acid so that the agar blocks were diffused at different temperatures, increasing by 10?C each time. The surface area of the agar For this experiment you would change the surface area of the agar so that the size varied. JAMES LAGDEN 9 SEB ...read more.

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