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The effect of temperature on a rate of reaction

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Introduction

Chemistry Coursework The effect of temperature on a rate of reaction Analysis In this we were able to see how temperature effects the rate of reaction. A pale yellow precipitate of Sulphur was formed obscuring the cross and signifying that the experiment is over. As I increased the temperature of the solution of Sodium Thiosulphate the time taken for the cross to disappear decreased significantly. In Graph one, showing all the temps. used against time taken, the curve is negatively correlating. In Graph two, rate of reaction against temp. the graph shows that as you keep increasing temp the rate of reaction slows down as you can see that rate increases at a steeper rate at the beginning of the graph than at the end. We can also see that there is a positive correlation curve, this is seen as temp is increased by ten degrees the rate doubles As I stated earlier this expt, produces a pale yellow sulphurous p.p.t which obscures the cross from view. ...read more.

Middle

* When starting the stopwatch at the beginning and stopping it at the end, time is lost as it is impossible to both start the stopwatch and prepare the beginning of the expt at the same time single-handedly. This causes the recorded time measurements to be unreliable. * When recording the temp. of the Sodium Thiosulphate in preparation for the expt. I again had to rely on the naked eye to record the temp. of the thermometer. Also after removing the solution from the Bunsen burner the temp. tended to fluctuate up and down, resulting in the recorded temp. often not being the temp. at which the expt took place. * When the solution was poured and measured, it was often not done accurately meaning some solution was lost, so the amount used was not equal to the amount recorded. * Unavailability of enough conical flasks and not rinsing the flask properly after each expt. resulted in deposits contaminating the later expts. ...read more.

Conclusion

So if i repeated the expt I would make sure to have more readings to improve my results. All in all my results were very accurate with only two anomalous results that can be explained by my sources of error. I still have enough accurate results to form a perfect curve and draw a conclusion from. If I repeated this expt I would take all of the observations I have made from my first expt and make sure that i improved on them, removing room for error and to perfect my results. Extensions I could extend this investigation by performing this expt using my improvements from this expt with different chemical reagents, still keeping all other factors except for temp constant. Some different expts I could use are: 2HCl + Mg Mg Cl + H 2HCl + CaCO CaCl + CO + H O (The temp is altered at constant intervals in both cases) After performing one of the expts with Hydrochloric acid and marble chips these results were collected: ?? ?? ?? ?? ...read more.

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