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The aim of this experiment is to see how reactions change when altering the temperature and concentration of the acid.

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Introduction

Rates Of Reactions Aim The aim of this experiment is to see how reactions change when altering the temperature and concentration of the acid. Factors Affecting Reaction Times There are various things we need to take into account on what can affect reaction times. There are four main factors: - Temperature By heating up the mixture the particles gain more energy, so they will then move faster, making a faster reaction time. - Concentration When the mixture has a bigger concentration there will be more particles, which will mean a faster reaction. - Particle Size The bigger the size of the particles the slower the reaction, so to get a fast reaction you will need a lot of small particles rather than one big one. - Catalyst A catalyst will speed up the reaction by acting as a template for the to substances, it will hold them together long enough for the substances to react without itself being involved in the reaction. It will speed up any reaction. Apparatus The apparatus we used was: - Three Beakers - Hydrochloric Acid - Sodium Thiosulphate - Bunsen burner - Tripod - Safety Mat - Gauze - Two Thermometers - Water Method The first thing we need to do is to collect in the apparatus and set up the experiment. ...read more.

Middle

Looking at the preliminary experiment I can see how concentration will change the rate of the reaction. I could see that the weakest acid, in terms of moles, reacted slower. The stronger acid reacted a lot quicker. Looking back at earlier work it is explained, because the bigger the concentration there is the more particles there will be. Due to there being more particles, there will be more collisions ending in a faster reaction. So I can now make my first hypothesis for concentration. I think that the stronger the concentration the faster the reaction. For temperature all I have to go on is scientific knowledge and previous work. Looking at previous work on reactions and looking at how temperature affects it, it says that as the particles are heated they will move quicker, meaning they will collide more, so that will make a faster reaction. There is an everyday example of this, an oven. As the oven gets hotter, the food inside will cook quicker, the colder it is the slower it will cook. So looking at the work and the example, I can now draw up my second hypothesis. ...read more.

Conclusion

44 Approx 40�C 37 23 37 26 39 28 40 31 41 40 Looking at the table I can see that the results are similar to mine, so I feel, by ignoring the anomalous results that my results as well as the other group's are accurate enough to support both my hypothesis. Conclusion Looking back at the experiment I can see that I have proved both my hypothesis. That the higher the temperature the quicker the reaction, and the stronger the concentration the faster the reaction. This proves that the concentration and temperature will always have an affect on the speed of a chemical reaction, as you can see in the table of results. This can be double-checked by comparing my groups results with the results of another group, that again proves my hypothesis are in fact correct. I feel that the experiment was completed very well and that the method was followed exactly. We only encountered one problem, which was quite important but didn't jeopardize what we found out, and that was our anomalous results. Looking back I could find no exact reason as to why the results turned out the way they did. ?? ?? ?? ?? Rates of Reactions ...read more.

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