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Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid

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Introduction

Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid Aim Investigation to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration of hydrochloric acid. Introduction In this experiment I am going to find out how the rate of reaction between sodium thiosulphate and hydrochloric acid is affected by changing the concentration. The equation to this is as follows: Sodium +Hydrochloric Acid Sodium +Sulphur +Sulphur +water Thiosulphate Acid Chloride Dioxide Na2 S2 O3 (aq) +2HCL (aq) NaCl(aq)+ S(s) +SO2(g) + H2O(l) This reaction usually produces a yellow precipitate. We place the reaction flask on a card with a black cross drawn on it. When the cross is completely obscured, the reaction will have finished. The time taken for this to happen is the measure of the rate of reaction. We must do this several times, and change the concentration of sodium thiosulphate. The rate of reaction is a measure of the change which happens during a reaction in a single unit of time. The things that affect the rate of reaction are as follows: 1. Surface area of the reactants 2. Concentration of the reactants 3. The temperature at which the reaction is carried out 4. Light 5. ...read more.

Middle

If the volume is different, then it could give different results to if it was at a constant volume. We must also make sure that we add both the water and the sodium thiosulphate at exactly the same time (into the conical flask with the hydrochloric acid in it), or it could effect the results of the experiment. We must start the stop watch at the exact time as we put the water and the sodium thiosulphate into the conical flask. To do this it is a lot easier if there are two people doing the experiment, so one person can put the two substances in the HCL, and one person can start the stop watch. Another thing we must do is to make sure that the conical flask is completely clean and free of any water or any other substance before we attempt to start the next experiment. Safety There are a lot of safety issues we must abide by in this experiment also. We must remember that the substances which we use in this experiment can be very harmful if used the wrong way. When we do this experiment, it may be necessary to wear safety goggles, as things are very unpredictable, and even though it is very unlikely that the solution would come out of the conical flask during the experiment, one must still be cautious of spills. ...read more.

Conclusion

However, there are still a few anomalous results which I will now point out. Hydrochloric Acid Sodium Thiosulphate Water Time Taken (s) 50 10 0 49 45 10 5 45 40 10 10 51 35 10 15 69 This is the only anomalous result that I have recorded. The result may have turned out anomalous because of basic human error, or maybe because we measured the substances wrong. It may have even been because we did not clean the apparatus properly. Apart from this, the accuracy of my experiment has been more or less accurate. Although there are a number of ways in which we could have made the results more reliable. For instance, we could have used better measuring equipment, because the apparatus we used was mainly basic equipment. Another thing we could have done to bring more evidence is to have tried to use the hydrochloric acid as the variable substance, and used the sodium thiosulphate as the constant substance. This would have brought more evidence to support the idea that the higher concentration of a substance, the faster it will react. I think that the evidence, which I have received, is enough to reach a suitable conclusion, but there are a few flaws to the experiment (which I have mentioned). Apart from them, the experiment is fine. ...read more.

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