Relationship Between Shape and Diffusion Rate Essay Example for Free

Relationship Between Shape and Diffusion Rate screenAimTo see whether there is a relationship between the surface area and the diffusion treadHypothesisI predict that the sm bother ward run intos of agar-agar-agar will turn clear, or diffuse prototypic, as it has a sm each(prenominal)er surface area. This is because there is less(prenominal) surface area and volume for the sulphuric venomous to diffuse into.Apparatus* Three sizes of agar, 20x20x20mm, 20x20x10mm, 20x20x5mm* 240ml of sulphuric acid 80ml per beaker* 3 100ml beakers* Tile used for placing the agar* thread to wipe off the sulphuric acid off the agar* 3 scalpels* Ruler, measurable in mm* Stop clock* CalculatorMethod1. First, cut trine pieces of sulphuric acid in the hobby sizes 20x20x20mm, 20x20x10mm, 20x20x5mm, as accu orderly as possible2. Next, fill the three beakers with 80ml of sulphuric acid each3. Then, plant the checkout clock, and make sure it is has been reset4. After, place the three blocks of agar into the sulphuric all at the same time, as well as starting the stop clock once the agar is in the sulphuric acid.5. Care amply perk up the three beakers using the scalpels.6. Watch until one of the blocks have gone alone clear.7. Once one of the blocks have gone completely clear, stop the stop clock and take reveal the three blocks of agar and place on the tissue, and wipe off the excess sulphuric acid from the blocks of agar to prevent supercharge diffusion with the two other blocks which have not been fully diffused to fully diffuse8. Cut the blocks in diagonal, through the middle and using a ruler, measure how much of it has morose clear on each side.9. Record the data for time taken, and the depth of the clear part on the table.ResultsBlock number123Block dimensions/mm20x20x2020x20x1020x20x5Predicted order of clearing321Actual order of clearing321Time taken for clearing8mn56.29sDepth of clear part on block/mm345Surface area/mm240016001200Volume/mm800040002000Surface are to volume ratioOO.3OO.4OO.6ConclusionMy prediction as to which block will go clear first was correct, being the smaller block, as its surface area to volume ratio was the greatest out of all three, even though there was not much difference between the three values. This is because the third block has a greater surface area for the sulphuric acid to diffuse into the agar, causing the diffusion rate to be greater. The blocks have become clear through diffusion caused by neutralization between the sulphuric acid and the agar, which is an alkaline.EvaluationQuite a few things did not go as planned in this evaluation, but I have come up with ideas on how to improve them if we do an experiment wish well this again. Firstly, the change integrity size may not be accurate from cutting it, and when it has been stirred, bits of it may have chipped off causing a change in its surface area. Next time, to avoid this, we could measure the block of agar much accurately when cutting it, and als o be more careful when stirring the agar and stir softer so that no bits may get chipped off.Not only that, but the time we place the three blocks of agar into the sulphuric acid may be different, as well as the time we started the stop clock. Next time, we may perchance find a different method of putting in and victorious out the agar so that it remains a fair test, and so that there are less mistakes in the test, which may be reduced by having one person per block of agar and beaker, as well as another person for the stop clock and placing it in and taking it out all at the same time as well as starting and stopping the stop clock. nearly other complication may have come from the amount of sulphuric acid in each beaker, which may not have been equal. This problem may be reduced by measuring the sulphuric more carefully, maybe with a measuring cylinder before then placing it into the beaker, instead of measuring it into the beaker straight away.Our measurements of the depth of t he clear layer of the blocks of agar jelly may have been incorrect as well, and to prevent this, we could possibly use a microscope next time and use a graticule to measure the depth that the jelly has diffused to obtain a more accurate result.The last problem I noticed go doing the experiment was when we were sop upting the sulphuric acid off the agar. I found that there may have been some sulphuric acid left on the agar after we have blotted it, which may have caused further diffusion and adjusting our result. This is caused from not blotting off enough sulphuric acid off the agar. Next time, we could carefully blot all the sulphuric acid, and use one piece of tissue for each block of agar so that there is no sulphuric acid on the tissue before blotting each block of agar.