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Investigate the rate of diffusion of Hydrochloric Acid into Gelatine.

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Biology Coursework PLANNING Introduction In this experiment I am going to investigate the rate of diffusion of Hydrochloric Acid into Gelatine. To do this I will use the same concentration and amount acid with the gelatine being cut into different sizes. The rate of diffusion is dependant on the surface/volume ratio to how quick the acid is able to diffuse throughout the whole of the gelatine. Equipment * Hydrochloric Acid * Gelatine * Tile * Test tube * Rubber Bung * Scalpel * Ruler * Stop Clock * Goggles * Measuring Cylinder Experiment In the experiment I will first of all cut up the pieces of gelatine into the correct sizes using the scalpel, tile and ruler. This must be done accurately otherwise this could affect the end results. I will then measure out 30ml of Hydrochloric Acid using the measuring cylinder and pour it into the test tube. I will then put in the gelatine shapes. I will then quickly put the bung in the stop and start the stop clock. I will hold the test tube at a horizontal position so that the acid in covering all of the surfaces of the cubes and so all the cubes are separate being easily visible. ...read more.


The larger the surface/volume ratio of the gelatine the quicker it is for the acid to diffuse completely into it. Also the smaller the surface/volume ratio of the gelatine the slower it is for the acid to diffuse completely into it. This is because the more gelatine that is exposed to the acid means that there are more Acid particles that collide with the gelatine. When the Acid particles collide with the gelatine, they diffuse into it, so the more collisions then the quicker the rate of diffusion. Biology Coursework OBTAINING Time Taken for Acid to diffuse Dimensions (mm) Surface/ volume ratio Time 1 seconds Time 2 seconds Average Seconds 10 x 10 x 10 6 763 905 834 10 x 10 x 5 8 251 300 276 10 x 5 x 5 10 208 223 216 5 x 5 x 5 12 173 177 175 From the graph I have drawn from the results table above it can tell me a lot of information about the experiment. It shows that there is a negative correlation from which a curve has been drawn. The graph shows that my prediction was correct in that the larger the surface/volume ratio then the quicker the Hydrochloric Acid will diffuse into the whole of it. ...read more.


Other ways in which this result may have been not accurate might include the fact of my warm hands could have altered the temperature of the acid; I could have put it on a clamp stand instead. Also some of the blocks stuck together for a short while which would have altered there surface/volume ratio, to prevent this from happening I could have done each of the cubes separately but this would have took a lot longer to do. All of my other results were accurate because the 2 different times were similar. I think that my line of best fit would be fairly reliable apart from the start where the result is a bit wrong. My judgement on when the cubes diffused I thought was very accurate. I think that I could use 10ml more of acid to make sure the large cube is fully under the acid. Also I think that I chose the right size cubes as I could easily compare them. I don't think all my results are reliable, especially surface/volume 6 as it doesn't fit the pattern. Other ways in which I could do the experiment include different shapes, triangles, and spheres. Though these would be very hard to cut and hard to find out the surface/volume ratio of them. I could also change the variable and change the temperature of the concentration of the acid to see what differences these would have made. Tom Chapman ...read more.

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