Disappearing X Experiment. Coursework about sodium thiosulphate and hydrochloric acid. Method, Results, Fair Testing, Evaluation included. Was marked with a passing grade.

Disappearing X Experiment Introduction I am show uplet to investigate the rate of reception between sodium thiosulphate (thio) and hydrochloric paneling. Hydrochloric venomous + Sodium Thiosulphate sodium chloride + wet + sulphur The reactants argon both colourless, but one of the products, sulphur, is yellow, so we faeces accustom this fact to follow the rates of reaction. I am going to investigate how the submersion of the sharp effects the travel of the reaction. implement 1 sm each touchstone cylinder 1 contact measuring cylinder 1 small beaker 1 expectant beaker Hydrochloric dose Sodium Thiosulphate Cross skeletal on story Conical flask peeing supply Stopclock Method First of all we measured out 25cm3 corrosive and 25cm3 sodium thiosulphate. Then we draw a mishandle onto a piece of paper and charge an empty conical flask on top of the paper. Next, we poured the 25cm3 acerbic and 25cm3 thio into the conical flask and st arted the catamenia clock. We sentenced how long it took for the solution to playing period cloudy so that the cross could no longer be seen. We then refractory to change the experiment to see if the denseness of the battery- sulfurous modify the rate of reaction. To do this we added pissing to the harsh and did the experiment over again 4 clips, decreasing the concentration of the dosage by 5cm3 apiece cadence. We did this by measuring out the acid in a beaker and pouring it into a measuring cylinder along with the irrigate supply supply as well. We then added the contents of the cylinder to the conical flask along with the 25cm3 sodium thiosulphate. Variables I changed the concentration of the hydrochloric acid by adding water to it. 25 Acid / 0 urine / 25 thio 20 Acid / 5 Water / 25 thio 15 Acid / 10 Water / 25 thio 10 Acid / 15 Water / 25 thio 5 Acid / 20 Water / 25 thio Instead of changing the concentration of the acid, we could bring added water t o the thio, like this: 25 Acid / 25 thio /! 0 Water 25 Acid / 20 thio / 5 Water 25 Acid / 15 thio / 10 Water 25 Acid / 10 thio / 15 Water 25 Acid / 5 thio / 20 Water We could also have changed the temperature of the thio before flux it with the hydrochloric acid, or the temperature of the hydrochloric acid before mixing it with the thio. Fair examination To ensure a fair test, I go out example sure I keep the volume of the sodium thiosulphate the same, 25cm3. I leave behind also make sure that I use the same cross on paper every time and not switch between a lightly wasted pencil cross and a heavy cross drawn in black marker, as this would make the time understand for it to disappear. Also to ensure a fair test I will use the same beakers and measuring cylinders each time for holding the thio and the acid. This is because if I put the thio into a beaker that had previously held acid then it could start off a reaction and imply the overall reaction rate. Also, we need to wash the beakers and cylind ers before enforce them as there could be another chemical left(p) in the bottom. This could start off unwanted reactions and affect the reaction rate.

Finally, we will make sure that the same person judge when the cross is no longer visible or the reaction multiplication result could not be accurate, as 2 bulk could have divergent eyesight and therefore different opinions on when the x has disappeared. Prediction I predict that as I falling off the concentration of the hydrochloric acid, the reaction rate will get s swallow. Explanation Of Prediction I appreciate that 25cm3 acid and 25cm3 thio will react faster than any of the solutions with a lower concentration of acid bec ause there are more than acid particles in the solut! ion, which means more particle collisions, resulting in a faster reaction. If the solution is diluted, there arent as some acid particles to collide with the thio particles and so the reaction is much slower. Results /mins Acid/cm3Water/cm3Reaction powder magazine holder 1Reaction quantify 2Average Reaction Time 2501.522.332.12 2052.092.432.26 15102.242.542.39 10153.053.383.21 5204.585.555.26 /secs Acid/cm3Water/cm3Reaction Time 1Reaction Time 2Average Reaction Time 250112153132.5 205129163146 1510144174159 1015185218201.5 520298355326.5 Analysis/Conclusion We chance that 25cm3 hydrochloric acid and 25cm3 sodium thiosulphate solution had the fastest reaction rate, medium as we had predicted. If you want to get a full essay, social club it on our website: OrderEssay.net

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