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How does the concentration affect the rate of reaction?

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Coursework: Rates of Reactions How does the concentration affect the rate of reaction? Introduction In my experiment I will be investigating the effect of varying the concentration of Sodium Thiosulphate when reacting with Hydrochloric Acid. I will be using the following reaction. + + Sulphur + Water The theory behind this experiment is that when the concentration increases the rate of the reaction increases the rate of molecular collisions. How to measure the rate of reactions I can measure this reaction by putting a piece of paper with a cross drawn on it underneath a beaker with the chemicals in and use a stopwatch to see how long it takes the solution to become to cloudy to be able to see the cross. ...read more.


I think that the concentration of the solution will affect the rate of reaction because the rate of reaction depends on how frequently the molecules in the reacting substances collide. Because there are more molecules about, the frequency of successful collisions is greater, and the reactions happen faster. Fair Test I will be trying to make this a fair test by trying to use the exact amount of the solution I need to use. I would use the same beaker every time. I could use the same cross on each experiment with by using the same colour. What Happened The solution gradually turned opaque because sulphur was made. Results Sodium Thiosulphate Water Hydrochloric Acid Time in Seconds 50 0 5 47.34 45 5 5 56.98 40 10 5 75.25 35 15 5 89.93 30 20 5 96.78 25 25 5 112.35 20 30 ...read more.


My results on my graph went in a negative correlation. Explaining Theses results because the higher the amount of Sodium Thiosulphate and the lower amount of water, the more successful collisions of atoms inside the solution there were. Comments I feel my results were quite accurate. My results came out in a negative correlation on a line graph. My only suspicions were that on the 1st and 2nd results, the gap between 50 Sodium Thiosulphate and 20 Sodium Thiosulphate was quite large (78seconds and 59seconds) but on the second the solutions seemed to work quicker than the other two sets of results (41seconds). Improvements I think, if I had did my work quicker, my results would have been most perfect. If I used the same cross on each paper it might have been fairer as tone of colour might have been slightly different. ...read more.

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