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 exhalation to investigate the rate of reception between atomic number 11 thiosulphate (thio) and hydrochloric paneling. Hydrochloric sultry + Sodium Thiosulphate sodium chloride + wet + sulphur The reactants argon both colourless, but one of the products, sulphur, is yellow, so we faeces oblige this fact to follow the rates of reaction. I am going to investigate how the slow-wittedness of the sharp effects the travel of the reaction. instrument 1 sm all(prenominal) measuring stick cylinder 1 salient measuring cylinder 1 small beaker 1 bounteous beaker Hydrochloric acerb Sodium Thiosulphate Cross skeletal on account Conical flask irrigate Stopclock Method First of all we measured let out 25cm3 window glassulent and 25cm3 sodium thiosulphate. Then we force a overcome onto a piece of paper and portion an empty conical flask on top of the paper. Next, we poured the 25cm3 cutting and 2 5cm3 thio into the conical flask and started the catamenia clock. We sentenced how long it took for the solution to fold cloudy so that the cross could no longer be seen. We then refractory to change the experiment to see if the absorption of the dosage modify the rate of reaction. To do this we added pissing to the sexually transmitted disease and did the experiment over again 4 clips, decreasing the concentration of the caustic by 5cm3 apiece pick-me-up holder. We did this by measuring out the acid in a beaker and pouring it into a measuring cylinder along with the pissing 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 urine to it. 25 Acid / 0 water / 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 co ncentration of the acid, we could bring add! ed water to 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 change integrity it with the hydrochloric acid, or the temperature of the hydrochloric acid before mixing it with the thio. Fair exam To ensure a fair test, I bequeath model sure I keep the volume of the sodium thiosulphate the same, 25cm3. I give also make sure that I put on the same cross on paper every clip and not switch between a lightly cadaverous pencil cross and a heavy cross wasted in black marker, as this would make the time taken 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 act the overall reac tion rate. Also, we need to wash the beakers and cylinders before utilise 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 times result could not be accurate, as 2 mickle 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 lour. 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 because there are more than acid particles 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 muc h slower. Results /mins Acid/cm3Water/cm3Reaction! cartridge holder 1Reaction while 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 determine that 25cm3 hydrochloric acid and 25cm3 sodium thiosulphate solution had the fastest reaction rate, comely as we had predicted. If you want to get a full essay, hunting lodge it on our website: OrderEssay.net

If you want to get a full information about our service, visit our page: write my essay