How concentration affects the rate of reaction between Hydrochloric Aci

How concentration affects the rate of reaction between Hydrochloric irate and Sodium ThiosulphateChemistry CourseworkHow parsimoniousness Affects a ReactionAimThe aim of this essay is to find out how concentration affectsthe rate of reaction between Hydrochloric Acid and SodiumThiosulphate.IntroductionThis experiment will be carried out by drawing a cross on a piece ofpaper and mixing hydrochloric acid and sodium thiosulphate together tosee if the cross vaporises. The concentration of hydrochloric acidwould change every reaction to show that concentration effects areaction. The time in which the cross took to disappear would berecorded as considerably as the temperature at the start and end of thereaction, the concentration of the hydrochloric acid and the amount ofhydrochloric acid and sodium thiosulphate used.Sodium Thiosulphate + Hydrochloric Acid ------------ Sodium Chloride+ Water + Sulphur Dioxide + SulphurNa2S2O3 + 2HCl 2NaCl + H2O + SO2 + SPreliminary WorkThe problems t hat arose whilst doing the preliminary experiment wasthat the beakers and measuring cylinders were not cleaned out properlyand slightly of the sodium thiosulphate turned cloudy were there waspreviously hydrochloric acid inside the beaker.The preliminary experiment showed that concentration effects the rateof reaction as well as the temperature does. The higher theconcentration of hydrochloric acid, the faster the reaction wasbecause the much particles there were to collide and break old bondsand make new bonds. Also if the temperature was higher the particleswould rifle around faster because they have more energy and would alsocause more effective collisions. GRAPHFair TestThe experiment will ... ... anomalies in spite of appearance the experiment and this may have been caused bythe stirring or the timer being started and stopped wrongly. I thinkthat our group had a good mode because our results showed what wewere trying to find out, which was to test how the change ofconcentration affects a reaction. To get rid of any anomalies we couldhave either not stir the mixture or use a machine to stir it at thesame speed each time. I think that the procedure that we had used wasadequate to test and that it was somewhat reliable. In my predictionI had stated that as the concentration increases, the time taken for a10% decrease in light intensity would decrease. This is because moreparticles would be in the higher concentration causing more effectivecollisions to happen. In future experiments we could increase therange of results as well as having more intermediate values.