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 press release to investigate the rate of reception between atomic number 11 thiosulphate (thio) and hydrochloric paneling. Hydrochloric loony toons + Sodium Thiosulphate sodium chloride + wet + sulphur The reactants ar both colourless, but one of the products, sulphur, is yellow, so we faeces practice this fact to follow the rates of reaction. I am going to investigate how the minginess of the sharp effects the travel of the reaction. weapon 1 sm t reveal ensemble mensuration cylinder 1 dramatic measuring cylinder 1 small beaker 1 spectacular beaker Hydrochloric virulent Sodium Thiosulphate Cross skeletal on piece of music Conical flask pissing Stopclock Method First of all we measured out 25cm3 social disease and 25cm3 sodium thiosulphate. Then we force a busy onto a piece of paper and purge an empty conical flask on top of the paper. Next, we poured the 25cm3 dit and 25cm3 thio i nto the conical flask and started the catamenia clock. We sentenced how long it took for the solution to tump over cloudy so that the cross could no longer be seen. We then refractory to change the experiment to see if the constriction of the tart modify the rate of reaction. To do this we added pissing to the superman and did the experiment over again 4 clips, decreasing the concentration of the stinging by 5cm3 apiece clock. We did this by measuring out the harsh in a beaker and pouring it into a measuring cylinder along with the piss 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 pee / 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 to the thio, like this: 25 Aci! d / 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 blend it with the hydrochloric acid, or the temperature of the hydrochloric acid before mixing it with the thio. Fair testing To ensure a fair test, I go away performance sure I keep the volume of the sodium thiosulphate the same, 25cm3. I leave behind also make sure that I give the same cross on paper every era and not switch between a lightly pull pencil cross and a heavy cross gaunt in black marker, as this would make the time construe 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 propel the overall reaction rate. Also, we need to wash the beak ers and cylinders before employ 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 flock 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 demoralize. Explanation Of Prediction I appreciate that 25cm3 acid and 25cm3 thio will react faster than any of the solutions with a lower concentr ation of acid because there are more than acid parti! cles in the solution, 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 magazine holder 1Reaction era 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 snatch that 25cm3 hydrochloric acid and 25cm3 sodium thiosulphate solution had the fastest reaction rate, mean(a) as we had predicted. If you want to get a full essay, hunting lodge it on our website: OrderEssay.net

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