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Find out will concentration of a solution affect the rates of the reaction. As a best way of doing it, I am going to use hydrochloric acid and sodium thiosulphate to react with each other.

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Introduction

Planning: My aim of the coursework is to find out will concentration of a solution affect the rates of the reaction. As a best way of doing it, I am going to use hydrochloric acid and sodium thiosulphate to react with each other. Sodium thiosulphate + hydrochloric acid ---> sodium chloride + sulphur+ sulphur dioxide + water Na2S2O2(aq) + 2HCL(aq) ---> 2Nacl(aq) + S(s) + SO2(g) + H2O(I) The apparatus I am going to use will be: -Sodium thiosulphate -Hydrochloric acid -Stop Clock -Measuring Cylinder -Conical Flask -Thermometer -Paper (with cross drawing over) What I am going to do is to use the product sulphur and measure how long it takes for the cross disappear by increasing its concentration. I am going to do that in this order: -Put 20ml of hydrochloric acid in a conical flask under a cross -Put 20ml of Sodium Thiosulphate in the same flask -Mix them in a conical flask -Take the amount of time when u can't see the cross using the stop clock -Check the temperature of the solution, are they endothermic or exothermic? -Write the results down in my results table -Repeat your experiment using a different molar To keep the whole experiment safe, I need to put goggles on whatever I am doing, because I am working with chemicals, also I need to wash our hands before we do everything. ...read more.

Middle

do it, you only need to mix 2 or 3 types of solution together and take the time to find out the results and prove the theory I predicted, also it's not dangerous in case there is an accident. Resources used: Thinking Chemistry by Michael Lewis and Guy Walker Oxford University Press Obtaining Evidence: I have got my results of the real experiment safely. These are the results I got: Sodium Thiosulphate(ml) 20 18 16 14 12 10 Water(ml) 0 2 4 6 8 10 Acid(ml) 20 20 20 20 20 20 Concentration(M) 1M 0.9M 0.8M 0.7M 0.6M 0.5M Time(s) -1st Time 26.38 26.84 35.12 38.52 50.50 58.00 Time(s) -2nd Time 26.25 29.10 35.78 40.15 49.94 60.63 Average Time (s) 26.32 27.97 35.45 38.34 50.22 59.32 I have done it in 6 different concentrations, so that I can have enough evidence and range to proof my prediction, I also done it twice to make sure I won't get anything wrong before I try to proof my prediction, this can also help me to write a conclusion about it. I think the results are reliable and accurate enough to proof my prediction later on, although it is difficult to keep everything accurate, but I think I have tried to use the help of equipment in order to keep everything as accurate as possible. ...read more.

Conclusion

But I am confident enough that my results are accurate enough to prove my prediction. The results are not that accurate, so I found out a few points for why it will not be accurate: -I don't know exactly when to start -I can't tell when to end -Amount of solutions maybe not accurate -Time accuracy may not be good enough -Solutions maybe contaminated To support my conclusion, I think the results and the graph will support my conclusion, they also show the scientific evidence of hydrochloric acid react with sodium thiosulphate. To improve, I will try and do the whole experiment again, with 2 different elements to react, e.g. magnesium and sulphuric acid, because they can react easily and range, so that I can see the pattern or sequence in it. But if I am trying to improve in this experiment, I will do these few things: -Measure the amount of solution using an electronic measurement -Or else use a computer to time or take the results, so that it will be more accurate -Do the experiment in a wider range of concentration; see if there will be any thing strange or different about it I will these few points can help me improve if I can do this again. Chemistry Coursework: Joseph Fisher Does concentration affect the rate of reaction? 1 ...read more.

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