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# Rates Investigation

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Introduction

Rates Investigation Aim The aim of the investigation is to see how the concentration of Sodium Thiosulphate affects the rate of the reaction between Sodium Thiosulphate and Hydrochloric Acid. Reaction The word equation for the reaction is: The symbol equation for the reaction is: Na2S2O3 + 2HCL ->2NaCl + SO2 + S + H2O Method 1) Put a cross on a piece of paper and place the paper on a desk 2) Put 50cm� of the chosen concentration of Sodium Thiosulphate into a conical flask 3) Add 5cm� of Hydrochloric Acid 4) Time how long the cross takes to disappear 5) Repeat each experiment 3 times to obtain an average 6) Try different concentrations of Sodium Thiosulphate Background Knowledge A factor that affects the rate of the reaction that I am going to be measuring between Sodium Thiosulphate and Hydrochloric Acid is concentration. The concentration of the two liquids is going to determine the speed of the reaction. If we keep the concentration of one of the liquids the same for all of the tests then it will be easier to work out the affects of the change in concentration of the other liquid. As the concentration of the Sodium Thiosulphate increases then so will the speed of the reaction because the higher the concentration the bigger the amount of Sodium Thiosulphate particles there are moving through the water. ...read more.

Middle

To make sure that this works and is a fair test I need to keep all of the factors that I discussed in the background knowledge the same apart from the one that I am examining. These factors that I have to keep the same are temperature, I will keep this as constant as possible by doing all of the experiments at the same time in the same room. The second factor is a catalyst, I will not add any other chemicals to the experiment other than the concentration of Sodium Thiosulphate and Hydrochloric Acid to keep this factor out of the equation. Chemicals Given The chemicals that are given are: 50 cm� Sodium Thiosulphate at specified concentration 5cm� Dilute Hydrochloric Acid Safety I have one safety consideration that I have to make. This is that I need to wear goggles just in case some of the Hydrochloric Acid or Sodium Thiosulphate splashed and gets into my eyes then I could harm me. This is the only safety precaution that has to be taken. Equipment list 1 Conical Flask 2 200cm� Beaker 1 100cm� Measuring Cylinder 1 10cm�Measuring Cylinder 1 Piece of Paper with a cross on it 1 Stop Watch The conical flask is for the 2 liquids to be placed in. ...read more.

Conclusion

As the concentration of the Sodium Thiosulphate increases so does the amount of Sodium Thiosulphate particles in the beaker. The more Sodium Thiosulphate particles in the beaker the more chance they have of hitting the particles of Hydrochloric Acid, because of this the speed of the reaction goes up as the concentration of the Sodium Thiosulphate does. Evaluation I would say that my experiment has been very successful. The results that I have obtained have proved the prediction that I made at the beginning and I have been able to say why this has happened. Looking at my graphs I can say that the results were very accurate. There are no results that are of the lines of best fit and there are no big variations in the results. I feel that I do have enough evidence from this experiment to support my conclusion and my prediction. I feel that taking 3 results has given me an average that I can rely more apon that one result because one results could be completely wrong and I would have mo evidence to prove that it was not correct. To improve my experiment I could have use a sophisticated machine that would have measure the amount of precipitate produced and so this would give me a more accurate timing. Apart from this I feel that everything else worked very well. ...read more.

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